tchebb [1] filed a deletion request for systemd-user-session-units-git [2]:

The last upstream commit was in 2015. I think most of these units either 1) duplicate upstream functionality or 2) don't work anymore as of 2023.

[1] https://aur.archlinux.org/account/tchebb/ [2] https://aur.archlinux.org/pkgbase/systemd-user-session-units-git/