@ratchetfreak Indeed. My understanding is that some older aircraft (Pipers & Mooneys, at least) weren't shipped with gust locks, so pilots use the seatbelt as a gustlock - which holds the yoke full back.
The airplane in that video looks relatively new, though I don't recognize the model.
@casey so you can't take off with the gust lock installed? :-) (How you'd get through the control surface checks with the lock installed being the better question...)