There are a lot of different ways of conducting a pre-purchase inspection. Dealerships have a standard checklist they use for all cars, so that will cover generic items like tire tread depth and brake pad thickness, but not anything specific to the NSX. A compression and leakdown test may or may not be included. A dealership mechanic who has a lot of NSX experience may also check NSX-specific items, like whether the transmission is in the snap ring range, etc, but again there are no guarantees. Body shops are much more likely to be able to detect any prior body repairs. People who are finicky about detailing are more likely to notice specific problems with the finish, interior, etc. No one person or shop is likely to be able to tell you about ALL of those kinds of items. Furthermore, some things, like whether the fix-it thingies have been installed or how much friction material remains on the clutch, cannot be inspected without spending a lot of labor to open up parts that you probably don't want to do unless you're prepared to replace parts once you open them up. Although previous work to address some of those things can also be verified via shop receipts.
I'm not telling you not to do a PPI, because any PPI can provide some useful information. By asking for specific inspections and/or taking it to more than one place (with different kinds of expertise), you can expand the thoroughness of what you know about the car. But it's tough to find out absolutely everything in one or two PPI's. The good news is, if 1-2 inspections tell you that the owner has (or has not) taken good care of his car, it's likely that additional inspections would come to the same conclusion.
