MarsSeed [1] filed a deletion request for python-slixmpp-omemo-git [2]: Unused VCS package from 2019; upstream and source URL target unavailable (cannot connect, server unreachable).
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/python-slixmpp-omemo-git/