This is not about crashes. By all accounts, the Waymo cars are mostly fully self driving, I beleive even the article author agrees with that. This includes crash avoidance, to the extent that they can.

The remote operation seems to be more about navigational issues and reading the road conditions. Things like accidentally looping, or not knowing how to proceed with an unexpected obstacle. Things that don't really happen to human drivers, even the greenest of new drivers.