Both testifying and “advice of counsel” defense are very risky hail Mary strategies. Defendants shouldn’t take the stand in fraud trials. He is probably going against the advice of his lawyers because he thinks he is smarter than them.
Testifying opens SBF to cross-examination. He is so arrogant that he thinks he will ace it, but evidence points towards him fumbling it.
“advice of counsel” defense waives the right to attorney-client privilege.