I see no good reason this would have better heat exchange than an unrolled plane. It has a slightly lower surface area to mass ratio (assuming equal thicknesses), and I'd expect the ridges to be more likely to trap water and air, giving the pasta a higher thermal mass and/or reduced pasta/water boundary area. I'm not an expert though.
It is amazing what rot is showing up on Wikipedia lately.
The wikipedia article doesn't mention heat exchange being the reason for the shape (unless it has been edited in the meanwhile).