I think the main reason the trial isn't going well for him is his obvious, overwhelming, and well documented guilt of committing the crimes he's charged with.
I think you're mistaking the feeling of guilt with the state of being guilty of something.
The person you're responding to isn't claiming that SBF demonstrated remorse at his actions, he is claiming that SBF admitted to the crimes he's been accused of.
Whether or not he feels remorse for those actions is a separate concern. But yeah, he's guilty.
No, it means he defied and then fired his good legal representation because he preferred to publicly and repeatedly proclaim his guilt before (and with the direct result of effecting) the burning of his political connections.
His tweeting through the FTX collapse was a masterclass in self-incrimination.