Found this post he made on instagram from a few months ago:
Robert Oberst on Instagram: “Figuring out this whole deadlift suit! Deadlift has been my weakness from day one in Strongman. I come from a football background and I was…”
Why, it's almost as if incompetent football coaches who didn't know how to coach the deadlift are the ones really to blame here. And, hey, it's almost as if we've said this before!
If you've got a guy who has the genetic capacity to deadlift 800+ within a few years of beginning training, I humbly submit you can have him do lots of silly BS in the gym that would still appear "to work." In this case, hang cleans aren't even silly BS - they're pretty far to the more useful side of the scale, all things fitness considered (think about what you see at your local globo gym). Doing heavy DLs and cleans from the floor would have been even better, but all things considered, you have a genetic freak doing reasonably useful things, of course it's going "to work."
But the root cause in this narrow case for his issue with deadlifts almost certainly still comes down to the classic football or S&C coach situation.
Broadly speaking regarding the issue as a whole, I stand by my earlier post.