I just took a look at the link. It's a V-twin. 2100 freakin' ccs of V-Twin.
I guess supercharging makes sense because it's the only way you'll ever get enough of an air change in single cylinders of more than 60 cubic inches each to exploit the displacement.
I've got to admit, I'd rather have a stock rocket. Hesketh has never given me a warm fuzzy feeling, and this bike leaves me cold.
FWIW, you could buy a Rocket III, an H2, and a CBR1000RR, and have change left over. So this bike is not about the wonders of the bike. It's about the joy of some rich guys experimenting. Sort of like Keanu Reeves, or Brad Pitt, or Ewan MacGregor ... they could invest in a project like this, and have some fun with the prototypes. I suspect that fun with the prototypes is what this is mostly about.