I'm not sure it's so easy to conclude that. The R35 was on the Bridgestone tyres, which we're told are 5 seconds slower than the Dunlops which R35s are available with in Japan.

The GT2 was 15odd seconds slower than the car is capable of in better conditions.

GT2's best lap is by Porsche test driver who can push the car to the limit, cos if he crashes it, big deal.
Likewise with the GTR's alleged best lap, driven by expert GTR driver who has been told to drive it one click down from crashing it.

Chris Harris drives a race car 997 at the ring and is driving a borrowed GTR that he didn't really want to spank...

I found it a very interesting read, but didn't conclude "Nissan " out of it