I think what Waymo's achieved is really impressive, and I like the way they've rolled out (carefully), but there's a lot of non evidence based defense of them in this comment thread. YouTube videos of people driving for hours are textbook survivorship bias. (What about all the videos people made but didn't upload because their drive didn't go perfectly?)

Nobody knows how many times operators intervene, because Waymo hasn't said. It's literally impossible to deduce.

Which means I also agree his estimate could also be wildly wrong too.