Maybe that’s why they haven’t cracked down on him. Justice is about accountability and preventing future harm, it’s not supposed to be purely punitive or retaliatory, and if he exiled himself and was convicted in absentia that would take care of a lot of issues vs the hazard of him being a “political prisoner” for years on end.
Many coup and counter-coup leaders in history end up in exile as a bargain: don’t try to retake the throne and bring more pain to our people and we won’t seek vengeance.