I'm not making judgement. I'm stating a FACT.
The car is a GTS4, and it is being sold as a GTR.
Now you bring AUTECH into this... Lets have a think about this... Autech is what? A Subsidiary of Nissan. IE, it is like HSV to Holden. What they badge their cars, is what they actually are... Autech 260RS = a factory vehicle. IE, Nissan may as well have just sold it as a Nissan 260RS.
The big difference would be, the Autech could have any number of huge power modifications made to it by Autech, but that's classified as FACTORY. So when you go to get your insurance you list it as an Autech 260RS that is STANDARD. This car you would need to list as a Nissan Skyline GTS4 (Because that's what it is) and then list each and every modification, and make sure engineering covers each and every modification.
I hope you can see the difference between calling a factory car a factory car, and calling a highly modified car a completely different model of car.