MarsSeed [1] filed a deletion request for python-flask-socketio-git [2]: Bogus, fixed-version non-VCS package from 2017.
As such, it is a majorly outdated duplicate of repo package: https://archlinux.org/packages/?q=python-flask-socketio [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/python-flask-socketio-git/