It's fine to say his games aren't an artform, but to apply a blanket statement to games in general is not. Games, as a form of media, have the same visual qualities of a movie, the sound of music, and the text of books, along with the elements unique to video games, so it's impossible to say that video games are not art and those are since games are basically just an ascension of other forms of media. One could say that the games that have been made are not art, or that they are lower quality, or blah blah blah and that would be an "acceptable" opinion, but you can't say that video games themselves are inherently not art. I'm not sure why any of this really matters though. I mean, the word "art" means nothing with how abused, overused, and vague it is. Half the time it's just used to give something importance it may or may not deserve or to sell crap to gullible morons.