Can confirm this guide will work for an Arch minimal install using LXQT + Openbox desktop environment on the Linux kernel (Not hardened lts or zen. Haven't tried those)
A couple of things to note is before installing the drivers as per the section in the ProtonGE tutorial, install the linux-headers package first
If you're on an nvidia card and you've followed the OPs directions etc and the game launches and the splash screen appears, then closes after a few seconds, try uninstalling the amdvlk package. For some reason it shows up after going through this tutorial at least it did for me.
Everything else should be identical to the tutorial posted here at least at the time of making this post.