Brian Mullins became popular with his YouTube channel called "Balls Out Physics" until he got banned in 2018 and has since completely vanished. He has left his legacy on videos that I managed to rescue where he puts forward another brain numbing theory that could prove a flat Earth.
The Earth would look totally flat if the camera wasn't using a fish-eye lens.

The bible states that there is a firmament "as waters above so below". You can see how the rocket hits something and behaves as though it is in water, you can even hear it on the video.