I suggested in my post that he may be on vacation, but back to the point at hand.
I know possession is 9/10th of the law, and just because he owns the PS3 in question doesn't prove he is the one to make the PSN account, even if he does use it, since it is on his PS3.
If he is not the one to make the account then he could always argue that he never agreed to anything. I don't know how well that would stand up in court, but proving that his PS3 accessed PSN through an account created on his PS3 does not without a reasonable doubt prove that the account was created by him even if it was created for him.
And I'm not trying to defend GeoHotz in any direct way, but as I understand it, this case has alot riding on it and I don't want to see him **** it up by not playing by the rules and getting his chances of setting precedence (like iPhone jailbreaking) thrown out along with his defense.