Is the guy wearing knee wraps in that vid? can see black but not sure if wraps or just sleeves to keep the heat in.
Anyway, strong muscle is a big muscle is a fast muscle. I don't know all the correlations between TUT and bb and hypertrophy etc, but I do know when you've got big weight on the bar you're not there to f**k spiders.
I think you'll find it's the opposite - the slower you go the harder it is to move the weight because you're not recruiting as many fibres during the lift.
Also, stretch shortening cycle (css) does help out the hole (referred to as "the bounce"), thing is this guy is doing 1/4 squats so not much elastic energy being stored.
Best thing is to experiment with yourself and make your own conclusions