MarsSeed [1] filed a deletion request for emacs27-git [2]: Emacs v27 is not developed since more than 2 years ago (2021-07), and is EOL.
Current stable maintenance branch is 'emacs-29'. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/emacs27-git/