MarsSeed [1] filed a deletion request for psm-git [2]: Upstream not maintained since 7 years ago, and this AUR build is even older, because it uses empty strings ('') in arrays, therefore it has been failing PKGBUILD validation for close to a decade now.
I don't think anyone wants to use this on AUR, so i think it's better to retire it. (Otherwise, anyone can revive the package from AURgit in any number of years in the future.) [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/psm-git/