I have the exact same problem that is described in this (https://forum.artixlinux.org/index.php/topic,3401.0.html) old thread. If I try to start the apparmor's s6 service I get this error:
unable to exec /usr/lib/apparmor/apparmor.systemd: No such file or directory
s6-rc: warning: unable to start service apparmor: command exited 127
Looks like the needed script is still missing.
Someone deleted the "install-systemd" line at one point again (unintuitively, it actually installs a sysvinit-style script). Should be fixed now though.
Thank you. It's working again now.