Well because I had nothing better to do I thought I would compile some evidence of the questionability of this video:
Firstly when you see him slide down the ramp he is head first and whilst in the air he is feet first.
Secondly when he hits the water there is a big splash over the side (our left) then it immediately zooms in with no water dripping off the wooden platform.
Lastly when he does hit the pool the plastic/rubber pool does not change shape which with the force he hit the water/pool would make the pool move over the platform and warp out of shape.
Still funny though!