If I had waited an hour or so, I could have answered my own question - duh!
The answer lies in the followup message from the Debian FTP Masters:
ACL dm: not allowed to upload source package 'bibledit'
The Debian Wiki at https://wiki.debian.org/DebianMaintainer/Tutorial says
that permission for a maintainer to upload can be set through a "dak"
command. As described in
Could it be that this dak command would resolve the upload permission issue?
Pkg-crosswire-devel mailing list