Yup the chin is a big giveaway too. If you break down the pitches from the tweet above you can really see how he gets on top of the front leg as sort of a catapult action on the fastball (stiff front leg and chin reared back) and the change up he stays back on with a lower angle on the block leg
He’s getting by with good enough stuff even at the AFL level but that would get exposed at the big league level I’d think