I think what they meant was that the car is still using the trans that it came with from the factory although as you said ATF clearly built it. I wonder how much abuse those transmissions can take and for how long? I guess only time will tell.
If you watch near the end you hear a flutter on top end, then they stop the vid with the rear of the car covered in smoke. Something happened or else just like other vids you would hear the announcer say something, or the crowd cheer, etc....