I was actually amazed and quite entertained by this guys videos. As others have said he clearly knows his aircraft and the landscape incredibly well, he obviously wouldn't attempt anything as daring until he'd made sure there was minimal risk.
There's a clear glide down to the sand bar and he has ample altitude to keep his speed high enough. As we all know those Highlanders can stop in such short stretches, it's not surprising that someone somewhere has all the necessary ingredients to really show the world what these puppies are capable of
Think of the reception Bob Hoover got when he rolled the 707! And there aren't many that would stand up and criticise Bob's airmanship. He also was known for rolling twin engine aircraft with pax on aboard.