Yes. This is the most extreme way of 'absorbing' a bump, since you don't contact it at all. This causes the minimum amount of speed loss. Absorbing by flexing with your skis/skates/wheels in contact with the bump will give some speed loss in the 'horizontal' direction, but less than if you didn't absorb it.
He keeps saying the exact opposite, that pressure exerted against the front face of the bump speeds you up and absorption slows you down. Hence my challenge for someone to show they can speed up on an upwards-sloping surface by adding pressure.
Mr. Kook may be confused about effects that can result on things like BMX/dirtbike jumps or a halfpipe, where adding 'upwards' momentum on the takeoff can make you go higher in the air and then faster at the landing. But this relies on using a jump or ramp to change your momentum from horizontal to vertical and back. The bigger the jump, the more leeway you have to change your landing position and the more effective this can usually be.