How do you know if it's the right person? The real one might be sitting at his/her desk laughing right now at this conclusion. The attack still has not stopped and the attack is very elaborate and planned out. The attack is also highly specific and attacks a hammerhost server. Based on what he's saying and the fact that the attack is still going on, I don't think this is the right person. He might be lying about it or talking about some other DoS attack unrelated to this one.
Well, until we figure out who did the attack, I'm staying away from him. I don't trust a word he's saying at this point.
Sadly for him, even if it wasn't him, Badspot already revoked his key.
At least, that's what Firecro is saying.