I'm not sure how it works, but it looks like the rowers put the power into a battery which in turns drives the motors of the car.
Reasonable enough, since it means you can charge up the car for occasions when you can't put enough power in manually, but of course the generator motor combination itself is significantly less efficient than a pure mechanical linkage, and any use of the battery drops that efficiency even more (although downhill energy can be stored in it, effectively regenerative braking).
If this is what it's doing then all well and good, but it's hardly original or spectacular.
