This photo may help to explain that:
The bottom is in V but heeling upwind the boat will not be falling on the bottom but on the side and since, even if very beamy, has fine entries, as you can see by the deck form near the bow, on this photo....
the boat will not pound excessively. Besides, as Erick can explain here better than anybody, you don't sail these boat like I sail mine going upwind with less than 30º apparent wind but with a bigger angle because these boats, with their huge power, go much faster a bit more out of the wind and can compensate that way in VMG. In the end you take waves at a much better angle and that will also allow for less pounding than if you took then really hard on the wind.
I was looking for a picture like that