Whatever custom work Nvidia and Nintendo were referring to having performed, it wasn’t done on the SoC.
In this case, Tech Insights tore down the Switch and confirmed the SoC inside the handheld gaming system is an Nvidia Tegra T210 with a Maxwell-derived GM20B GPU.
Of course, they could be referring to other aspects of the system and its software, but the SoC itself is a standard Tegra chip.
Ever since Nintendo announced the Switch, it’s been cagey about the exact details of the platform.