Hmmm... I've read the exact opposite. From what I know he was either banned or kicked off of the dev team and is seen by the jb community as extremely cocky and usually not good on his word. I've even read that he announced a hack for the PSP that is almost 8 months late now
Not saying you are wrong, just that I've heard the exact opposite...
All that to say, Ill believe it when I see it.
He did release spirit as promised.
I wouldn't doubt him much, he does seem to have the dev teams backing.