I've yet to find a game that I couldn't play (though knowing me I probably forgot one or two). It's mainly mods that I've not been able to implement, as some of them require running an exe file.
However I've had very helpful people tell me I can do all that in a wine instance or something similar so mainly it's just my own laziness (and lack of understanding about how to "do it in a wine instance") that's holding me back from installing fancy modpacks or playing the latest Stalker gamma version.
Also i don't play multiplayer stuff so the anti-cheat thing issues don't usually apply to me. So there's that.
People are saying dementia, but also by many accounts he's always been pretty stupid.
So I'm not sure this is one of those super damning pieces of evidence.
Also he usually says "I don't know anything about that" or "we're looking into that" when he wants to avoid a question or statement he doesn't like.