First of all, almost any Arch update induced problem can be solved by downgrading the offending package to the previous version, which handily is available in /var/cache/pacman/pkg/. This is an essential Arch troubleshooting skill.
Even an unbootable system (which has only happened once in my 10 years of using Arch because I didn’t read important news) can be fixed this way, because you can always boot from the installation usb stick and then use arch-chroot to access your installation and fix problems.
Secondly, if the problem was indeed caused by an Arch update, you will just reinstall the problem if you run a reinstall script.