The following post sounds as though he indeed may have abused his NSX:
A bad downshift can not only cause unusually rapid clutch wear; it can even destroy the engine (a "money shift", i.e. overrevving to exceed redline). A bad downshift is abuse by anyone's definition.
However, unlike others here, I would not jump to the conclusion that the clutch is worn, or is not worn, until the transmission is opened. Maybe the clutch is not worn and there is another explanation that will mean that the warranty will cover it. But if the clutch is worn, it is not covered under Acura's warranty. They may or may not cover the repair anyway, as a goodwill adjustment, but the warranty explicitly excludes coverage of clutch wear, as well as problems resulting from abuse (which, in this case, may turn out to be the same thing).
In any case, once they open the transmission, they should be able to see whether or not the clutch is worn, or whether there is evidence of any other problem. It may be that the problem is totally unrelated to the bad downshifts. Or, they may decide to cover it anyway, as goodwill. We won't know until the dealer opens it up. Until then, it's all idle speculation anyway.
Exactly
That's baloney, pure and simple. You cannot predict whether or not they will cover it. You don't even know what the problem is yet. Until the transmission is opened, none of us do!
It amazes me how some people want to jump to conclusions (and even start talking about lawyers!) before we even know all the facts...