I thought this was about Roger Ebert saying they weren't art because they are too interactive, that the artist's perception of the world isn't there.
I think there are still limits in the game worlds created by the gamemaker, so if a forced perspective is required for art, there still is that in games. And someone experiencing the "art" in a game can do different things, much like how someone can look at an abstract painting or sculpture and interpret something different from it.
I didn't read the article, but what does Hideo Kojima know? I'm not all anti-MGS but there were several points in MGS2:Substance where I felt like I was just watching a movie. I'd walk down the hall, and, oh! Another 15-minute cutscene. I'm not exagerrating much at all.
If movies are art, then MGS is art.