He can stay here as long as he wants.
Everyone that got hurt or damaged by psychiatry have the right to share their story or progress, whether you like it or not.
Some don't recover at all, and that's a fact.
The fact that he wasn't able to recover, doesn't mean he should leave.
Newcomers have to face the reality of those injections for what it is, which is that some recover and some don't.
Time will tell.
I would like to point out that permeant damage from antipsychotics is rare and mostly associated with old antipsychotics like haldol. Even then its pretty rare. One case i know if the Beach Boy Brian Wilson who had way beyond normal doses of thorazine prescribed to him and got pseudo parkinsons. I also knew a guy in the psych ward with it