It was injury. He ruptured his achilles.
Thing is, he was insured and took the isurance payout when he quit playing due to injury.
If he plays pro again, it could be insurance fraud and he has been unable to play.
It is rumored, but I don't think official, that LIV may have bought out that insurance policy, which wasn't cheap.
He's going to play so something must have changed with the insurance situation.