I've seen a couple of videos of this kid playing GH3 (I think there's also a couple of him playing Freebird and Jordan on GH2 on youtube), and I always find the comments below the video somewhat funny. It's like everyone becomes suspicious of the video because it's a kid, or becomes butthurt because a little kid is better at the game than them.
That being said, I think that's the highest score I've seen someone get on that song so far.