Reasons for it to be a work
The cameras kept recording the whole time.
Fortune were the only wrestlers to come out. Maybe it was to not break kayfabe but when the injury is that serious the wrestler himself is the main priority.
The cameras were ready backstage in exactly the right spots.
Bully Ray kicking AJ and screaming at Fortune.
The whole thing just seemed too carefully planned.
It takes everyone's attention away from Jeff Hardy
Reasons for it to be legit
The referee made the X signal which means a legit injury.
It doesn't look like they landed in the right place. It looks like they were meant to land in the middle of the tables but got the positioning wrong. (I mean, they were being guided by Flair...)
If you look closely, you can see that around the area that they landed, there's a slightly raised part of the ground. When the powerbomb happens the black sheet gets pulled over it but it looks like AJ might have hit his head there.
AJ didn't move at all after the powerbomb.