No, I realize that he put it in after he was down. That's not what the refs were looking at, or why he scored the touchdown though. The point is that while he was still in the air, the ball went over the line. He was then pushed backwards, before he was down, sending the ball back from the end zone. After he was down, he put the ball into the end zone, which didn't mean anything, and isn't why the touchdown counted.