Being a fanatical ludologist, I think he just means that games are AWESOME OMG and everybody who thinks differently is an old fart.
But as I personally deeply enjoy growing older, I read it as a sign that perhaps that whole games-are-sports-are-awesome-yay gang is going to leave me alone.
I agree with Bruno that the author and his brethren might have a surprising idea of what constitutes an adult videogame. But that's his problem, not mine. I find it very important that even people on his side of the fence acknowledge the distinction. Without explicitly dismissing "the other kind" -other than the implication that being young is cool yay.
I sympathize with your worries about the state of art in our times. To a large extent this is what motivates me as a creator: to make things that help people grow in a significant way, a way that enriches their existence and helps them contribute to society in a constructive manner.
Chris Pruett
mentioned something interesting though. He pointed out that only now this older generation is fluent enough with games to be a viable audience.
I disagree somewhat since I only started being serious about videogames at the age of 35 and I had plenty of experience to fall back on having played Pac Man in the arcades and Wolfenstein on my PC. And that was 10 years ago. And I was in Europe (always a bit late to the capitalist parties and more moderate in its embrace).
I also feel that it is a designer's job to be as inclusive as possible. Especially when working for an adult audience where one can expect more variety. Game controls and structures should be simplified so that the player can concentrate on the content. I don't think we can already count on everyone knowing how to use a gamepad or WASD controls.