But the platform is called "PC" on the site, not "Windows". If it was the other way around, sure, totally. A Linux computer is still a PC. The Surface Pro X is still a PC. If it runs on a Linux PC, then it undoubtedly works on Windows x86 as well.
You said it yourself. "Linux is no less PC than Windows..."
Okay, cool. One category it is then.
"...so I think it would be great if they would be treated equally."
They are. With the one, all encompassing category called "PC".