That's a little power/weight right there, and a little of Tsuchiya driving the wheels off the NSX.
My dad has an '86 Testarossa, and it's a beautiful car, sounds amazing, and is really an "event" to drive....but it's not a track car. He's had it on the track, but it weighs nearly 4000lbs, has pretty archaic suspension (2x shocks/springs per-corner in the rear), and the brakes just are not up to the speed/weight of the car on faster tracks.
The NSX might not be as fast on paper (acceleration/top speed), but it's much easier to drive fast than the TR from my experience.
I'd be curious if this would be the same result between an NA2 NSX and a 512TR given the mild revisions to both.