It does suck that he stuck it out when he could have dipped out and then gets no playing time, but also he’s looked awful and from the looks of his live Instagram stuff he’s likely not in the best shape
I think it's very possible he just doesn't have the right mental makeup/hasn't put in the work required. His limited time has been beyond rusty to the point it looks like a guy who is totally lost in competitive games. Guys who are competitive would get enough out of pick up games to stay sharper than this.
Of course I may still be a bit biased because he blocked me on twitter and the only thing I could find that was critical of him 2 years ago when I got blocked was "Purifoy needs to be more focused on defense to meet his potential as a player" basically. And he had to be searching his name to find it.