That is an awful video that doesn’t in any way debunk what I sent you. The entire argument is if you execute a combination you’re able to land shots at a faster speed in a brief window. It is incredibly impractical to land a boost/slide combination followed by immediately landing your shots in mid air. You have to be on a flat surface and move your aim away from your target and should you do it you get a very short time of having a speed boost. Can it be done? Sure, but such a technical trick with brief speed advantage (if you don’t compromise yourself for trying it) that is limited in where you can execute it is such a poor argument for the benefit of advanced mobility. The majority of 343’s pro players dislike these features