Getting back the point of the thread I think there's a more simple explaination ... Switch was always supposed to launch in fall 2016.
The delay to 2017 was a software hiccup, but Nintendo wanted the hardware for holiday 2016, no way would they intentionally aim for a March 2017 launch. In 2014 Iwata said it would take about 2 years for them to have what they were working on bear fruit.
The hardware seemed finished for a while too with units floating around in February, so they had just been sitting around.
Possibly this chip would not have been available for fall 2016 and Nintendo had to make these decisions two years ago most likely, the Tegra X1.
It was too late in the game likely to change to a TX2, a chip that Nintendo possibly had not testing/R&Ded for.
