Since it is a pretty well-established principle that you can drive a vehicle on your own private property without a license (like on farms and ranches - it doesn’t make much sense to go up and down your driveway), then the same logic that makes the license inapplicable ALSO makes various traffic and safety laws inapplicable. This is private property, the law doesn’t govern what this guy did.
Now, if the rear tire went so much as an inch off of the driveway and on to the (public) street, then this guy would be toast. However, it is clear that he wasn’t THAT drunk, or he’d have gone into the street. He knew what he was doing, that’s pretty clear.