I would get a PPI done by somebody who specializes in NSX'es - dealer PPI's aren't quite as comprehensive/model specific as far as I'm aware. It'll just be generic things like checking fluid levels, tire pressures, wipers/blinkers/headlights working, etc. A dealer PPI might just check off a box saying "windows go up/down", but an NSX specialist will know to watch the speed, listen for crinkling/cracking as it's a common failure in NSX'es, for example.
For reference: I got a PPI from one of the area's most reputable NSX specialists - aside from a few things not too surprising for a 23 year old car (leaking clutch master/slave cylinder, leaking inner/outer axle boot on driver's side rear, slow window regulators, some corrosion on ignition coils), it passed the PPI with flying colors. 200psi compression on all cylinders with zero leakdown, solid body/frame, tb/wp were verified to be updated and new, etc, etc.
Bought the car with confidence after that (and some leverage to get a few thousand knocked off the asking price) - and 6 hours later, my wife and I were stranded on the side of a highway waiting for a tow truck. The throttle cable had snapped, so we got it towed to the nsx specialist's shop the next morning, and found out the throttle cable part is now discontinued. Custom cable had to be made, which took a few days. Got the cylinders and coils, window regulators replaced in the meanwhile, which all in all parts+labor, cost $3600. Still needs a new clutch now before the car is daily driveable (the current one shudders once warmed up), so once all is said and done I'll have spent about $6000 on top of the price of the car - and this is a car that passed the PPI from a reputable mechanic. So, to summarize - a PPI will be thorough, but it will be nearly impossible to predict/catch everything. Which is why I recommend you get as thorough a PPI as you can, you can't have one that's too thorough.
Moral of story: You can't have a "through enough" PPI, and even then it won't catch everything. I def. would not trust the 'dealer PPI', especially from one who is incentivized to sell the car. Even then, get an NSX specialist to PPI, and budget another $2-5k just in case - as reliable as these cars are, they are still 20+ year old cars and it *will* need some TLC. Don't let minor failures from the PPI scare you away though - instead, I'd recommend using that to negotiate the asking price down.
YMMV, sorry to ramble but I hope this can provide some insight.
My story many not be typical though, I got the '91 nsx with only 35k miles on it, so it wasn't driven very often and sat in storage a lot.