I've watched the video I posted kinda frame by frame and when he hip extends, if you look at his back/upperback it seems like a lot of the extension comes from that area... it's really weird. Like he's very spinal-erector active at the end of the extension.
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Yup, and it probably has to do with improved mobility and flexibility due to front squatting as well, and being able to keep a vertical torso while lowering.