Plain old narcissism. This was the charm-heavy love bombing phase. The contempt, the passive aggression, the "your money is on its way", and perhaps the outright rages would have come later.

The real point of the interview was the reassure the narcissist that he was still smarter, still more significant, and still more of an operator than the lawyer who convicted him.

At the very least he got his prosecutor to turn up, which must have been a small consolation thrill.