It's a weird/ combo exercise.
He's not really dropping under the bar fast, going down slowly but with a push press up of the bar then lowering himself down.
Hmmmmm...I'll try the bw for 15reps challenge...must be absolutely f0cking brutal on the wrists.
OHS is an Oly exercise but not many coaches persribe it to a lifter once they are past 'learning' the lifts stage. Chinese do OHS but thats because the ones that do they typically Squat Jerk so it's much more specific for those dudes. Only the 2 guys in the 77 class do Power/ Squat Jerks. The rest of them so the split Jerk now a days. Can't say for all of the Chinese team, but thats what I saw at the last 2 Worlds.
It's good for mobility, balance and learning to sit in deep with the bar over head. My coaches figure that if the lifter can do it already why load the weight up? Just Snatch. The loads relative to your Clean, front and back squat aren't that much so as long as you have got the bar stable over head it won't cause too much trouble getting up. The time under tension of the wrists is a KILLER also.