Meanwhile in China …
Once again the saying
Somewhere in China there is a little girl warming up with your max.
turns out to be accurate.
Update: reddit comment by olympic_lifter:
They’re probably not focused on the power portion of it, just building the strength to stay tight. It’s also a relatively low-fatigue exercise, even with the extreme weight, which might not be the case if you were really trying to be explosive. Since you can’t be very explosive at that % above your max, there’s not so much point, but you can do a fair number of them this way and use it to improve your dip-drive positions.