I suspect he means 500 GFLOPS (FP32). 1 TFLOP would be the FP16 number, which is more of a hypothetical peak, FP32 is what you would use to compared to other game consoles.
A Tegra X1 still runs very hot for gaming, the Shield Console for example runs at almost 20 watts when running a game, that's waaaaaaaaaaay too hot for a portable device, that would kill a monster sized battery in under 2 hours.
My guess is they are getting Tegra X1 performance more or less (which is 500 GFLOP FP32/1 TFLOP FP16), but they just die shrunk to the chip to 16nm and added some architectural improvements from the Parker X2.
That would bring down your energy consumption to 7-8 watts for that level of power most likely, much more reasonable.









