Tesla's former VP of Autopilot Software&Hardware (oversees all low-voltage hardware, aka everything else besides High Voltage battery drivetrain) was Jim Keller[1][2], who also designed Apple's System on a Chip A4 mobile processor and an early AMD chip architect. So that makes a lot of sense.
Jim Keller didn't have anything to do with developing the hardware for hw2. The board is from Nvidia, it's a stripped down variant of their Drive PX2 computers.
No. That board uses a reference design from Nvidia. They redesigned Nvidia reference designed removed one of the fpgas, changed interfaces added GPS directly on board. If you are not familiar a reference design would be selling your prebuilt computer and telling you this works. Afterwards you come in throw the case out and change anything but try to maintain the relevant electronic connections between components. Remove the ones that you don't need and add required ones. Plus design and layout a circuit board with your new requirements and parts.
[1] https://electrek.co/2018/04/25/tesla-autopilot-jim-keller-le...
[2] https://en.wikipedia.org/wiki/Jim_Keller_(engineer)