I don't think it is fake. Say what you will, but he is a clever man. (For me - he is cut from the exact same cloth as Egosnot - clever, fame seeker and hypocrite)
Methinks he wants a job at $ony. That's why he won't release anything anymore. He wants everyone ESPECIALLY $ony to know that he can breach any security they throw into the PS3. He has said in the past $ony can employ him to work on the security of the PS3.
So he will continue hacking the PS3 to bits in the hope that he gets a job! Maybe when $ony decides to confiscate all his PS3's and computers he will start sharing out of anger for not getting employment from them.
It will be great if he does share his exploits with the world. I see light at the end of the tunnel - DON'T ORDER MORE TUNNEL!