The human side of those stats, whenever I've seen them presented next to self-driving car stats, has always been an aggregate of all human driving, a vast amount of which is in environments or conditions that Waymo doesn't operate in.
The road to mass adoption of autonomous vehicles probably wont happen in any poster's lifetime on this board. The reality is most people on here are quite narrow minded and can't 'understand' why it is not as easy as "hey I found a stat that shows Waymo is safer than humans!!11!".