I think the implication in the article and from people on here, is that he has been (mostly) fit since September but has only started twice. Obviously had the injury in Jan but according to The Athletic that was a separate ankle issue not related to the ligament problem that kept him out for so long.So I can understand why he hasn't played but I struggle to understand how he will suddenly start playing for a different club.
On paper he has now recovered from all his ailments, but hasn't been utilised or trusted by the manager (as per the rumour). His move to West Ham is an opportunity for him to get more minutes and show that Hurzeler (if the rumour is true) was wrong about him.