This is where the term "bozo" comes from... "bosozaku"
https://thenewswheel.com/moments-in-car-history-the-japanese-gentlemans-agreement/
The GT-R is a good car on paper, but the chassis on most GT-Rs (including the NISMO) are nowhere as good as American rivals like the Camaro and Mustang V8 models, which also are more refined than the GT-R especially if you select the 2SS or Premium package for the American counterpart.
The Japanese typically use press cars that are tuned and/or reworked on the inside with removed factory passenger and rear seats + a roll cage. The GT-R NISMO's Nürburgring lap time however was NOT a lie (unlike the Civic Type R's), but it was for the N-Attack Track Package which is NOT road legal in most of the world, just like the ZL1 1LE isn't legal in Europe.
The GT-R NISMO is BARELY "faster" than the standard ZL1, let alone the 1LE version. The Corvette Grand Sport, LET ALONE the Z+ versions DETHRONED the GT-R NISMO on the Hockenheim Short.
I had a math teacher in high school tell me that I should always +15-25sec for whatever the Japanese bring for their press cars to the 'ring...