Zero chance it is the Tegra X2 unless Nintendo suddenly is going against their entire history of designing hardware. The Gameboy used a processor from the 70's. Gamecube to Wii U were based off a 1998 IBM PowerPC and GPUs from 2000 and 2008 respectively.
Remember - Nintendo follows very closely "lateral thinking of withered technology" when designing hardware, as Gunpei Yokoi called it. The Tegra X1, a rare case where Nvidia sort of flopped, coupled with a 20nm manufacturing process which is very rarely used (and outright skipped by the majority of the market), fits right into the bill.







