That video has been out for a while now. At least 2 C-Class teams are foiling. Unknown is Steve Clarke's foil package, Team Invictus' foil package, and the Portugese foil package, though I suspect the last 2 are non-foiling and Steve is probably semi-foiling. The Canadians are playing it close to their chest but have L-foils, with the intent to be a surface skimmer. This will all be very exciting to watch.

I am of the belief that you need a big, lightweight platform with lots of efficient power. Wider is better, longer is more pitch stable etc. Just because it works on an AC72 doesn't mean it works on a C-Class, and is even less likely to work on a 20 footer. Even if it does pan out, all successful attempts I've seen require world class sailing to master. Bringing this to the masses might require another revolution in the area of waterproof electronics.