It's gaming in the sense that racing in the Special Olympics is still racing. Sure, but for the purposes of the marketplace it may as well not exist unless you're talking about Linux+Android gaming.
It was my bad calling it "PC gaming." You're misinformed on this. Check out protondb.com - by opting into the Steam beta in Linux you can play Windows games, oftentimes with the same or better driver performance than in Windows. And sometimes not. But to liken it to the "Special Olympics" is a bit cruel and ignorant.