This isn't a good argument because it implies if these AVs have successfully not killed their CEOs during a closed (i.e. controlled) test, that they are safe on public roads. But it seems like the majority of AV accidents so far involve unpredictable and uncontrolled conditions.

IOW, setting this up as some kind of quality standard gives unjustified cover ("Hey, our own CEO risked his life to prove the car was safe!") if AVs fail on the open road, because the requirements of open and closed tests are so different.