Yeah, no kidding. I mean, that guy's REALLY good at it, and he's also using bigger equipment, so he's really bombing it out there an impressive distance on big water. But regarding the basic mechanics behind it, you mean everyone doesn't use this? I do it all the time on small streams and it's my main cast to get distance in tight places.
I never knew the name of it and always called it a "snap" cast. And described it as a regular cast/roll cast hybrid.
In the simplest form (shorter casts) it's simply regular casting, but rushing the forward cast. i.e. you start a normal backcast, but then you do the forward cast as the line gets to you, NOT STRAIGHTENING OUT BEHIND YOU. This requires a weak backcast, i.e. just kind of throwing the line up in the air before the forward snap.
If you need more distance, you do the same thing, but first pile the line on the water in front of you to add water resistance, like a roll cast. But you need some slack so that the backcast isn't moving the anchor. Like before, you start a normal (weak) backcast and rush the forward power cast, before the "anchor" even comes out of the water. You have yourself a roll cast with a large D loop and some line momentum going backwards, hence more power. The downfall is that laying that line in front of you takes an extra second or two, and if there are rocks or sticks around your feet it tends to catch.