He glosses over this but I suspect that is almost all the newer multiplayer games that are popular.
I was gaming on Linux from about 2020 to this year. I went back to Windows for gaming. It was either constant faffing or there was always at least one game that doesn't work that well. I don't want to spend an hour or messing with various launch options in Steam.
Performance is often claimed to be better on Linux than Windows. However it is highly dependant on the distro, kernel, GPU, game and whether you have particular magic settings configured. I am sure it is faster if you are running bazzite or one of the other gaming focused distros, but I run Debian on pretty much everything. So I just decided to use Linux for serious stuff and Windows for gaming.
Don't get me wrong it is loads better than it was, which was pretty much non-existent. But it will be fairly niche for quite a while yet.