Something not right in that video, a lighter car with more horses and torques should accelerate faster (assuming perfect traction). The old school spoiler is one thing, the other issue I heard mentioned was the tall gearing on the vette but a 7 speed gearbox should negate that once you get past the relatively long first gear. Regardless, something not right there.
In that video, the vette cornered better than the GTR, how does that work? RWD faster than AWD through a corner with all it's fancy gadgets???
Maybe it was a driver issue?
Found the answer. Vette has a 7 speed manual gearbox with 3.42 diff ratio, however 1st gear is only 2.28:1(very longggggggggg) and 4th gear is 1:1 with the last 3 gears been overdrive. So effectively you are still driving a 4 speed box with a couple of overdrive gears.
They probably should have tested the 8 speed auto box which looks to have a much better gear spread.
Data can be found here
http://www.chevrolet.com/content/dam/Chevrolet/northamerica/usa/nscwebsite/en/Home/Vehicles/Performance/2015_Corvette_Z06/Model_Overview/02_pdfs/MY2015%20Corvette%20Z06%20Spec%20Sheet_web_lo-res.pdf
GT-R specs can be found here
Nissan GT-R Overview, Specs
Which has a much better gear ratio spread 1st - 5th with 1 OD gear.
The Vette would start in what is almost the equivalent of 2nd gear in the GT-R........ and that is the answer to the problem.