He's broken. It's not his fault. It happens to players.
But not having an adequate back up is responsible as much as anything.
For the last year he's been dropped in and out after that serious injury. And he's never recovered and might never recover, because his body is simply constantly compensating.
That injury he got in August 2021, and then aggravated when Benitez rushed him back to training, was really, really bad. The treatment of him since has been daft.
It just all builds up and unfortunately he is now unreliable. But the club knew that as of August 1st last year, when he suffered another long-term injury.