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.
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.
His tweeting through the FTX collapse was a masterclass in self-incrimination.