I don't think he was yanking everyone's chains for a majority of his posts on either forum. His posts were much too detailed and included pictures. And the fact that he keeps trying to apologize to the forums he was banned from instead of sneaking around and blending in like an intelligent person would (minus the attempts to make numerous user names on here...that's why I mentioned intelligence), then he wouldn't be continuously acting like this. Plus, he's linked many videos of him playing piano for recitals show how old he is - he definitely is young.
And since he's posting personal videos like that after posting about how his brood's stomachs exploded, it seems to me he's trying to garner our support and praises for his "accomplishments" as a pianist while simultaneously displaying his failings. Either way, I'm fairly sure he's an 11 year old boy like he says.