I agree that he was making empirical claims as though they were first-principle claims, and ignoring the fact that cameras are better optical sensors than the human eye,
Not necessarily. Pretty sure the older HW3 sensors from Tesla had considerably less instantaneous dynamic range than the human eye — probably not enough to be a problem most of the time, but still...
But more than that, cameras are notably worse than eyes, because they're in the wrong spot. A pair of eyes three feet back from the window sees the scene and focuses through whatever is hitting the glass, so unless it's a deluge, the contents of the glass are largely out of focus. With small sensors mounted close to the glass, you don't have the depth of field helping you in the same way. With cameras outside the car, it's even worse, and they get blinded constantly.
What cameras do have is quantity. Your eyes can look in only one direction at a time. Cameras can look in every direction. They can see that something is coming at you from the side or behind. They can see around corners better, if placed correctly. They can judge distance and speed of oncoming vehicles with mathematical precision that human brains can't consistently match.
They also don't get tired. They don't get drunk. They don't get distracted. They don't start burning when sweat gets in them. And so on.
These things can make camera-based cars considerably safer than human drivers, at least in theory, particularly once you consider that the average contains drunk drivers, tired drivers, distracted drivers, etc. And most driving accidents are not caused by loss of visibility, statistically speaking.