Here’s why it’s a double hit. I slowed down the video. A ball wants to follow the tangent line. The primary legal reason it goes forward of the tangent line is if you have top spin. The primary reason it goes back of the tangent line is if you have bottom spin.
This ball is obviously hit with bottom spin and should immediately follow the tangent line shortly and then start pulling back as the spin grabs. That didn’t happen.
The ball goes well forward of the tangent line out the gate due to a double hit. Then the back spin grabs and pulls it back off the double hit line. A legal hit would have never went forward drastically in the first place.
White = tangent line
Red = double hit line
Yellow = action line after double hit
Blue = action line without double hit
Even though I slowed that down, I could see that clear as day in full speed on my first viewing because I knew what to look for.