Agree with everything you've said, but there is a difference with this latest development, at least in my view. The majority of his lies regarding the private keys before were that he couldn't sign a message because he didn't have access to the keys - they are in a trust, a courier has them, I don't have the password, they will definitely be delivered on this date, no this date, no wait this date, they've been delivered but it was only the public keys, et cetera ad absurdum. Him now claiming that the bonded courier who is supposedly delivering the private keys is an attorney and therefore he doesn't have to hand them over to the court is now essentially him saying "Nuh-uh, I don't want to".

His argument has gone from "I can't prove I'm Satoshi because I don't have the keys", while although provably false, at least could be believed, to "I just don't want to prove it", which is downright moronic for someone caught in the middle of a multi-billion dollar lawsuit. If he did have the keys, then the only sensible option for him is to prove it to the court and pay up half the bitcoin, since he is otherwise potentially facing jail time for perjuring the court.

Honestly, I'm surprised the judge is giving him so much leeway to continue to his ever more ridiculous lies to the court. Just set a final date for the keys to be handed over, and if it is not met, charge him with perjury.