I think I'd try another dealer. Seems to me the car ought to have a rev limiter which should prevent over reving to the point of destruction. I suppose dumping the clutch at high revs might to it, but the clutch plates should show some signs of damage as well. Don't know for sure your driving style, but if you're not just downshifting at high revs and letting the clutch out too soon, I don't see all that damage no matter how the fly wheel is constructed. If it's designed to protect the transmission I would think the threshold would still be pretty high. Stuff like that doesn't get torn up in routine driving.