By the way it swim i think he's completely blind or at least have a very bad eyesight.Does he have sight in one eye? If he has sight in one eye at least, and if the pond owner is willing to monitor him and potentially target feed him if he's struggling to compete with the others, he might be able to make it in a pond.
You did a good thing by rescuing him, you're a kind person! Poor thing was so battered looking, I'm amazed he survived as long as he did, even with as hardy as tilapia are!
The thing is, with so many fish in the pond, I think it's almost impossible to target feed him. But there's smaller pond with less fish and some lobster, I think he have a chance there, we'll see when he recovered.