ARM cpu made by MediaTek.

But probably worth clarifying it's not a typical "MediaTek CPU" some might assume by that. It has Nvidia's customized ARM CPU implementation + their GPU.

This has off-the-shelf Arm cores.

I think that Nvidia made GPU and CPU, and Mediatek made other parts of SoC necessary for a notebook. Grace is Nvidia's own CPU ARM core

I believe Grace is an ARM designed core. Vera is the nVidia designed core.