That certainly looks like an interesting contraption. What inspired you to use it?
However, that mule kick device is also sounding interesting. Maybe do them after Donkey Squats!
It appeared to me Devan is not pushing his knees <> as ge descends. This is a key part of creating a hole to sink into. I also think it's one of the toughest parts of the squat to learn and to do it consistently. Cue is of course to spread the floor.
Nice too see a post from you at any rate!