A lot of hip bend, not a lot of knee bend, notice how he stays on the toes, there's no ankle collapse, a ton of foot and calf strength to do that considering the tremendous amount of power that the foot is receiving from the upperleg.
It's funny.. each sport has a majority of strength coaches who "do shit wrong", because most of them focus on some kind of distorted specificity to the sport.. however, you then have football strength coaches who may not know much of anything about the science, but they are all about: get your bench, squat, and olympic lifts up. It's just tradition and it makes sense because of how brutal the game is. If that was the default mindset for basketball (simply getting STRONGER), it would be scary what the competition would look like.
Those plates look a lot like the ones in that crossfit gym I once went to, when I deadlifted my 184 kg deadlift (405 lbs).
In that gym there were plates as "big" (in diameter) as a 25 or 20 kg plate, but they were 5 kg. They were like that for weak people to do snatches and cleans off the floor from the "correct height" (question remains - what business do weak people have with Olympic lifts?).
So there's a great chance that except for the thicker plates which might be ~15-20kg, all the others are 10 kg or less (probably 5). It looks like 20+20+10+10+5+5 on each side, which is 70+70+20 = 160 kg.
But I hate how his feet are not exactly in the same positions (weight distribution) and his lack of control of the movement.
This makes me remember Brandon Roy training with his trainer and the trainer allowing him a tremendous amount of knee valgus occuring during plyos and lunges and all that jazz. Unbelievable.
Doing weighed vest plyos increases the GCT (ground contact time). What that means is the muscle load is increased and the "tendon contribution" decreases (in other words, the movement becomes more "muscled up" and less "springy" or "reactive"). Even more, there's a tendency to "break" more (at the hip, knee or ankle).
One "advantage" would be to see where you "break" but then it's a matter of understanding if the breaking is occuring due to lack of strength or too much dominance (for example, if breaking at the knee is a matter of lack of quad strength (knee collapses and goes forward) or too much quad strength relative to the posterior chain, so the quads are preferentially recruited when the load is heavier and therefore, for the quads to express their "strength", the CNS "wants" to move the knee forward to get quad range of motion). It's tricky to figure out what the case is (well, not really, look at your squat numbers to figure that out).
I used to do the other way around for my reactivity - donkey ankle bounces. I would support my chest on something (usually a trash can) and take away a lot of my upperbody weight. Then I would jump up and down while being UNLOADED. That would allow me to be VERY reactive since I'm weighing like half my bodyweight.
I can, if my knees are straight. Once they start to approach a half-squat depth, getting the glutes to fired requires a tremendous amount of effort. Like, actively thinking about that happening like crazy. No wonder my half squat sucks.
On the other hand, the glute recruitment becomes better if I just push the hips back, like in a RDL. But once the knees bend (knees travel forward) as in a jump or half squat, the glutes are being turned off.
When I jump off two, for example for a jumpshot, I feel 100% quad. No glute no nothing. In fact, my two leg jump with a ball in hand looks and feels horrible, for a jumpshot. And when I land I feel like crashing. I basically just bend at the knees and jump, the hips don't do anything.
So how can I be quad dominant in a jump and yet suck at half squatting? Doesn't make any sense. Unless I have weak quads and even weaker posterior chain, so the CNS is like "well OK, let me choose a knee bend since the quads are a bit stronger".
But then shouldn't I be better at half squats, like high bar squats (although it's a serious flexiblity issue there that is limiting me) and suck at deadlifts?