Repeating the general response to this from hundreds of blogs and websites:
He admits to never actually playing a game himself. Its like me saying the mona lisa cant be art after someone describes it too me
He is extremely invested in the medium of film, and as such has a bias in declaring video games cannot be art.
His main arguement seems to be "because you can win the game by playing it, it cannot be art" By that logic if you watch someone play a game it then becomes art.
He made his original statement, refused to discuss it or adress anyone's arguements with it, then made another statement which he again refuses to defend. He's basically an old man making blind statements and refusing to listen to people who prove him wrong.
He also seems to confuse something being BAD art with something being NOT art. Yeah alot of video games aren't art, but neither are alot of movies. If the character modellers, level designers, OST creators, etc artistic endevours do not make video games art, then films such as Avatar aren't art either. If games can't be art because of dante's inferno, then movies can't be art because of transformers 2, and books cant be art because of twilight, and sculptures can't be art because of this misshapen blue-tac monster I just made while writing this.
I also hate the way he innocently asks "why do people care anyway? Whats the big deal?" While garnering untold publicity from taking the opposite stance on a medium he admits to having no direct knowledge of. Of course artists want their work to be considered art. And people who enjoy the fruits of an artists labour want it to be aknowledged too. I bet if someone told him cinema wasn't an art form he would have something to say.
He also tried to make a distinction between art and "high art" which is pompous art critic talk for "shit i like." This instantly makes me dispise him, because it's akin to saying "well I'm much more cultured than you, so my opinion is more valid than yours." There's no high or low art, there's only good or bad art. And even then it's entirely based on your personal opinion. Some consider Jackson Pollock's work to be extremely artistic, personally I just find it boring and mundane. That doesn't mean paintings aren't art. or that they're low art.
Heres some links that disagree with Ebert:
Seanbaby's article "why ebert is wrong" Kellee Santiago's TEDx talk responding to Eberts original post "are video games art" - This is the video the post you linked to is in response to.