kb1000 [1] filed a deletion request for multimc5 [2]: multimc5 essentially is a duplicate of the multimc-bin package, which is maintained by peterix, the dev of MultiMC. multimc5 builds it from source, but does not receive support in MultiMC's communities, and has several features broken.
[1] https://aur.archlinux.org/account/kb1000/ [2] https://aur.archlinux.org/pkgbase/multimc5/
