The intent is to allow for version-locked archlinux in a time where enshittification/ensloppification has taken a lot of working software from us.
Example from /etc/pacman.conf:
[core] Server = https://altm.tudbut.de/2026/01/07/$repo/os/$arch # Include = /etc/pacman.d/mirrorlist
You may also need to turn off package signing, which is dangerous in theory. Packages are only taken from archive.archlinux.org however, meaning it's relatively safe, assuming you trust this site.
SigLevel = Never