Pretty amazing how that foil tip flexes
Kinda like the suspension on a car. Probably adds a bit of dynamic stability.
In the first half of the vid, the board was further down on the starboard tack - I presume more of a pointing mode.
Later, on the port tack, the board is further up with quite a bit more spray off the side. Looks like they're going a good bit faster as well. Perhaps reaching.
Impossible (at least for my amateur eyes) to judge true wind direction from the vid. Video mentions 12-14 TWS, but the water/waves don't look like it.