Tesla actually has a lot of expertise in chip design in Pete Bannon and formerly Jim Keller. I think most people know who Jim Keller is, but if not you can read his wikipedia[1]. Pete Bannon is also an industry giant and worked with Jim Keller at PA Semi and subsequently Apple on their A series chips. These two have decades of experience designing chips that went into tens of millions of devices. Tesla’s FSD computer is in hundreds of thousands of cars. They know what they’re doing.

https://en.wikipedia.org/wiki/Jim_Keller_(engineer)