In fairness to SBF (who I have no sympathy for and think should rot in prison), this could very easily just be set up to look like it's him.

If I was someone else with access to that wallet, I could easily see waiting until SBF is out on bail and then moving funds to make everyone think it's him.

On the flip side, if it was SBF, he maybe could have done it before. Martin Shrekli has stated how he did blockchain operations from a contraband cellphone while in jail.