while trying to reproduce the example, i ran into some confusion myself...

I downloaded the fonts and installed them, then ran the script:
mtxrun --generate
mtxrun --script font --reload
context --make

verifying the existence of the font within the context region:
mtxrun --script fonts --list --all --name jost | cut -d" " -f1
shows the font appeared to be installed:
jostblack
jostblackitalic
jostbold
jostbolditalic
jostbook
jostbookitalic
josthairline
josthairlineitalic
jostheavy
jostitalic
jostlight
jostlightitalic
jostmedium
jostmediumitalic
jostnormal
jostregular
jostsemi
jostsemiitalic
jostthin
jostthinitalic

Now when i compile the example, lmtx will shows an issue with the font:

preloading latin modern fonts (second stage)
fonts           > 'fallback modern-designsize rm 12pt' is loaded
fonts           > names > font database has mismatching configuration
and file hashes
fonts           > names > warnings are disabled (tracker 'fonts.warnings')
fonts           > names > identifying tree font files with suffix 'otf'
fonts           > names > scanning path
'/home/vm/data/context/tex/texmf-project' for otf files
fonts           > names > 0 otf files checked,  okay
fonts           > names > scanning path
'/home/vm/data/context/tex/texmf-fonts' for otf files
fonts           > names > 0 otf files checked,  okay
fonts           > names > scanning path
'/home/vm/data/context/tex/texmf-local' for otf files
fonts           > names > 0 otf files checked,  okay
fonts           > names > scanning path
'/home/vm/data/context/tex/texmf-modules' for otf files
fonts           > names > 0 otf files checked,  okay
fonts           > names > scanning path
'/home/vm/data/context/tex/texmf-context' for otf files
fonts           > names > 1 otf files checked,  okay
fonts           > names > scanning path
'/home/vm/data/context/tex/texmf-linux-64' for otf files
fonts           > names > 0 otf files checked,  okay
fonts           > names > scanning path
'/home/vm/data/context/tex/texmf' for otf files
fonts           > names > 222 otf files checked,  okay
fonts           > names > identifying tree font files with suffix 'OTF'
fonts           > names > scanning path
'/home/vm/data/context/tex/texmf-project' for OTF files
fonts           > names > 0 OTF files checked,  okay
fonts           > names > scanning path
'/home/vm/data/context/tex/texmf-fonts' for OTF files
fonts           > names > 0 OTF files checked,  okay
fonts           > names > scanning path
'/home/vm/data/context/tex/texmf-local' for OTF files
fonts           > names > 0 OTF files checked,  okay
fonts           > names > scanning path
'/home/vm/data/context/tex/texmf-modules' for OTF files
fonts           > names > 0 OTF files checked,  okay
fonts           > names > scanning path
'/home/vm/data/context/tex/texmf-context' for OTF files
fonts           > names > 1 OTF files checked,  okay
fonts           > names > scanning path
'/home/vm/data/context/tex/texmf-linux-64' for OTF files
fonts           > names > 0 OTF files checked,  okay
fonts           > names > scanning path
'/home/vm/data/context/tex/texmf' for OTF files
fonts           > names > 222 OTF files checked,  okay
fonts           > names > 446 tree files identified, 0 skipped, 0
duplicates, 446 hash entries added, runtime 0.045 seconds




and it will fallback to the default lmroman12-regular

I noticed that if i omit the context --make
and only run
mtxrun --generate
mtxrun --script font --reload

then compile the example, lmtx will show a different set of issues.
Most likely related...



open source     > level 1, order 1, name 'cont-yes.mkiv'
system          >
system          > ConTeXt  ver: 2019.12.17 16:30 MKIV beta  fmt:
2019.12.22  int: english/english
system          >
system          > 'cont-new.mkiv' loaded
open source     > level 2, order 2, name
'/home/vm/data/context/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv'
system          > beware: some patches loaded from cont-new.mkiv
close source    > level 2, order 2, name
'/home/vm/data/context/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv'
system          > files > jobname 'j2', input './j2', result 'j2'
fonts           > latin modern fonts are not preloaded
languages       > language 'en' is active
open source     > level 2, order 3, name './j2.tex'
fonts           > preloading latin modern fonts (second stage)
fonts           > 'fallback modern-designsize rm 12pt' is loaded
fonts           > defining > font with asked name 'jost-100-hairline' is
not found using lookup 'file'
fonts           > defining > unknown font 'jost-100-hairline', loading
aborted
fonts           > defining > unable to define 'jost-100-hairline' as
'JHair--0'
fonts           > defining > font with asked name 'jost-200-thin' is not
found using lookup 'file'
fonts           > defining > unknown font 'jost-200-thin', loading aborted
fonts           > defining > unable to define 'jost-200-thin' as 'JThin--0'
fonts           > defining > font with asked name 'jost-300-light' is
not found using lookup 'file'
fonts           > defining > unknown font 'jost-300-light', loading aborted
fonts           > defining > unable to define 'jost-300-light' as 'JLigh--0'
fonts           > defining > font with asked name 'jost-400-book' is not
found using lookup 'file'
fonts           > defining > unknown font 'jost-400-book', loading aborted
fonts           > defining > unable to define 'jost-400-book' as 'JBook--0'
fonts           > defining > font with asked name 'jost-500-medium' is
not found using lookup 'file'
fonts           > defining > unknown font 'jost-500-medium', loading aborted
fonts           > defining > unable to define 'jost-500-medium' as
'JMedi--0'
fonts           > defining > font with asked name 'jost-600-semi' is not
found using lookup 'file'
fonts           > defining > unknown font 'jost-600-semi', loading aborted
fonts           > defining > unable to define 'jost-600-semi' as 'JSemi--0'
fonts           > defining > font with asked name 'jost-700-bold' is not
found using lookup 'file'
fonts           > defining > unknown font 'jost-700-bold', loading aborted
fonts           > defining > unable to define 'jost-700-bold' as 'JBold--0'
fonts           > defining > font with asked name 'jost-800-heavy' is
not found using lookup 'file'
fonts           > defining > unknown font 'jost-800-heavy', loading aborted
fonts           > defining > unable to define 'jost-800-heavy' as 'JHeav--0'
fonts           > defining > font with asked name 'jost-900-black' is
not found using lookup 'file'
fonts           > defining > unknown font 'jost-900-black', loading aborted
fonts           > defining > unable to define 'jost-900-black' as 'JBlac--0'
backend         > xmp > using file
'/home/vm/data/context/tex/texmf-context/tex/context/base/mkiv/lpdf-pdx.xml'
pages           > flushing realpage 1, userpage 1, subpage 1
fonts           > defining > font with asked name
'jost-100-hairlineitalic' is not found using lookup 'file'
fonts           > defining > unknown font 'jost-100-hairlineitalic',
loading aborted
fonts           > defining > unable to define 'jost-100-hairlineitalic'
as 'JHairI--0'
fonts           > defining > font with asked name 'jost-200-thinitalic'
is not found using lookup 'file'
fonts           > defining > unknown font 'jost-200-thinitalic', loading
aborted
fonts           > defining > unable to define 'jost-200-thinitalic' as
'JThinI--0'
fonts           > defining > font with asked name 'jost-300-lightitalic'
is not found using lookup 'file'
fonts           > defining > unknown font 'jost-300-lightitalic',
loading aborted
fonts           > defining > unable to define 'jost-300-lightitalic' as
'JLighI--0'
fonts           > defining > font with asked name 'jost-400-bookitalic'
is not found using lookup 'file'
fonts           > defining > unknown font 'jost-400-bookitalic', loading
mtxrun --generate
mtxrun --script font --reloadaborted
fonts           > defining > unable to define 'jost-400-bookitalic' as
'JBookI--0'mtxrun --generate
mtxrun --script font --reload
fonts           > defining > font with asked name
'jost-500-mediumitalic' is not found using lookup 'file'
fonts           > defining > unknown font 'jost-500-mediumitalic',
loading aborted
fonts           > defining > unable to define 'jost-500-mediumitalic' as
'JMediI--0'
fonts           > defining > font with asked name 'jost-600-semiitalic'
is not found using lookup 'file'
fonts           > defining > unknown font 'jost-600-semiitalic', loading
aborted
fonts           > defining > unable to define 'jost-600-semiitalic' as
'JSemiI--0'
fonts           > defining > font with asked name 'jost-700-bolditalic'
is not found using lookup 'file'
fonts           > defining > unknown font 'jost-700-bolditalic', loading
aborted
fonts           > defining > unable to define 'jost-700-bolditalic' as
'JBoldI--0'
fonts           > defining > font with asked name 'jost-800-heavyitalic'
is not found using lookup 'file'
fonts           > defining > unknown font 'jost-800-heavyitalic',
loading aborted
fonts           > defining > unable to define 'jost-800-heavyitalic' as
'JHeavI--0'
fonts           > defining > font with asked name 'jost-900-blackitalic'
is not found using lookup 'file'
fonts           > defining > unknown font 'jost-900-blackitalic',
loading aborted
fonts           > defining > unable to define 'jost-900-blackitalic' as
'JBlacI--0'
pages           > flushing realpage 2, userpage 2, subpage 2
close source    > level 2, order 3, name './j2.tex'


Attachment: pEpkey.asc
Description: application/pgp-keys

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