Of course he did not kill himself. He just became more valuable dead rather than alive and speaking.
Jails take extreme care in making sure their guests have absolutely no access to items they can use to commit suicide.
I think the reason why someone is allowing this evidence to disappear and reappear is because they want to demonstrate the obvious manipulation that can happen with these cases.

Very interesting stuff though!
The only thing that would surprise me is if Epstein were to come back from the dead.