The guy in the video is a mainly a Squad/Arma reforger player who is also dabbling in Bellum. He brought an extremely expensive PC to play these ultra realistic games at max graphics. However on linux max graphics will kill your performance because ray tracing is broken. He seems to be happy so I cant complain but I dont think it will last given my experience playing these games at a way more casual level and having a much higher tolerance for issues. But also the devs listen to his opinions so if he raises linux preformance issues they might actually be fixed which would be awesome.