Humans cannot react very fast, this incident comes down to fast reactions and the good all around vision in the Waymo. On these measures a human isn't competitive.
And this is just something you've decided is true or...? One sensor with determinate output based on an input from a finite set, sure I won't argue with you, but in any domain with indeterminate outputs coming from inputs that are of an infinite set, there is no meaningful notion of reaction time, there are imperfect decisions made with incomplete information at a moment during the dangerous spiral of number of possible responses shrinking and information completeness growing, (should I react now or wait until I have more information about how effective each of the dwindling number of path s available to me are shrinking) too name just one complexity.
I believe that we will get there and sooner than skeptics believe, but we are so far away from machines having driving skill equal to that of the average human driver, who happens to be driving while distracted 99% of the time.
Here an objective difference is described: a Waymo vehicle reacted to new visual information in a direction that a human driver would not be likely to be looking.