Originally Posted by
Polaris OBark
The guy in the video (Lee McCormack) is a proponent of the idea that what really matters for mountain bike fit is the angle he calls RAAD in the figure below:
https://ridelogic.bike
The saddle height, position, etc doesn't even enter into the calculation. (Enduro Bros don't sit.)
Lee has his fans and detractors in the MTB community.