Well yeah, pretty much. It should be very difficult but not at the level where you need to psyche out and burn on the CNS a ton in order to complete that rep.
The idea is to stimulate, not to annihilate. When you psyche out you overload the CNS and you're going to need a ton of recovery time to get back to your old self. A daily max is just a hard rep but nothing so hard that you can't recover from pretty quickly.
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.