could Trump be totally immune from prosecution?

In the thumbnail title, "freed" might be misleading: he needs to be in jail first. You can be absolved of all guilt, immune from prosecution, or found not guilty of a crime, but to me, freed implies confinement of some kind, often physical. And in non-physical cases, you're not freed of accusations: you're more likely freed of/from, say, marital obligations, holy vows, etc. In essence, you're freed from constraints, and an accusation isn't a constraint. Confinement after sentencing is.