The whole thing is carefully orchestrated theatre. The face mask, the neck-brace, Paetongtarn being in the car with him, the time of release at 6:09 which has a meaning of 'moving forward' according to the Thai media.
I don't believe for a moment that he has ever been ill. I'm not sure if I believe he has even been in the hospital for that time either.
You simply can't trust these people. They are duplicitous, greedy, corrupt liars.