You ain’t wrong. The level of arrogance stinks. Especially when the author put effort into documenting the sources etc.
There do appear to be a lot of these know-it-all-but-contribute-little types around.
Maybe a few are missing, but simply asking, and I’m sure they’ll provide. If someone wants a better build system, they could volunteer to do it themselves.
Those in open source circles will see through places like GamingOnLinux, Lemmy, Reddit and the official IRC/Discord. Those that don’t find out probably are no where near the open source gaming community so it won’t really matter.