When you also consider the amount of backspin that ball had to get that high, as soon as it hits the roof that energy is going to push that ball further out - and the video shows that, too. Its like a topspin shot on a tennis court, only in reverse since the ball is hitting the ceiling and not the ground.
I think without the roof it winds up foul or its a wall scraper home run - but not some 450' long bomb - high exit velo straight up in the air doesnt mean if it hits the roof 310 feet put that its going another 200 feet further