Since we have yet to build a system that is capable of "full self-driving ... at a safety level substantially greater than that of a human driver" I'm not even

Since we have yet to build a system that is capable of "full self-driving ... at a safety level substantially greater than that of a human driver" I'm not even sure they can make the claim that their existing hardware supports this. They might have high hopes, but there's no way to know what combination of hardware and software will be necessary until the problem is actually solved.