Eh who knows about the wreck pic. The GTR's fancy handling can't fix everything, could've been coolant on the track in a corner or whatever.
As for the rest: denying warranty claims for tracking a performance car seems very wrong on the surface, but on the other hand it's a tough situation for the mfg. If it was a legitimate engineering/mfg fault and the component failed early, the mfg really should cover it regardless of where it happened. But even with a faultless car, track stress will eventually destroy every last component in the car, given enough time (and the timeframe's going to be a lot shorter than grandma street driving the car, I don't care how "performance" oriented the car is). Making the call on the acceptable wear+tear before failure is pretty hard, especially if there's no official record of how many miles spent on-track and in what conditions, etc.
For reference, check out the specs page on the 370 Nismo RC (factory race car):
NISSAN FAIRLADY ZNISMO RC . They recommend a replacement interval of 5,000 km track distance on the whole drivetrain. That's about 3,000 miles. I do about 200 track miles on an average HPDE weekend. If I were doing that once a month, I'm hitting 3,000 miles in a little over a year. Now granted, I wouldn't *expect failure* at 3K track miles for the whole drivetrain, but by then you're definitely into significant wear + tear.