The xorg-server port provided by MacPorts had already been a newer version than the previous official XQuartz release (from 2016) for a while.
It probably used the Rosetta emulation layer before
Compiled from MacPorts, so source for AS...
Correct, I've been recommending folks use MacPorts to build xorg-server if they want to stay up to date as I was not able to put out new XQuartz releases for a while. Right now, there are a few bug fixes in the latest XQuartz release which I haven't pulled back into MacPorts yet, but I'll do that at some point soon.
This is a binary package built for ARM to. E installed directly without other dependencies. Macports builds from source