The ball had already broken the plane.
The delay in the call happens all the time while the ref process what he just saw.
It was a TD, period.
When? There is not one picture of the ball breaking the plane. The only time the ref could have seen the ball in the endzone was after been scooted it there. Unless the ref has x-ray vision and could see the ball through his arm, but it is still questionable if the ball ever made it.