I strongly agree that the safety comparisons aren't anywhere near the same ballpark. They are just too apples to oranges.
All that said, I don't think that means we can't evaluate whether they're safe in the limited contexts they're being deployed in. We just have to be aware those statistics are only as good as their context (weather, geography, terrain, traffic patterns/devices/laws, social norms, etc).
I'm initially most hopeful for constrained environments (city, low speeds, parking) and Waymo in particular, because of the house amount of investment and very thoughtful and cautious strategy in terms of deployment.
I worked in the AV space for years - not at Cruise - but during one of my first driverless rides in a Cruise car, we ran into a few blocks of SF where the power was out. About 3 street lights in a row weren't functioning. At each one the Cruise stopped completely for about 45 seconds before crossing - even if there was no traffic coming from it's left or right. That delay was so that a remote operator could clear it to proceed after it detected that there wasn't a functioning street light where it expected there to be one. After the first street light we were getting honked at and swerved around by cars behind us while it paused and waited for clarification.
Comparisons between the safety of robotaxis and human drivers are strange to make when 'robotaxis' still depend on remote operators for fundamental parts of the driving task