If you feels it’s close to autonomy then I would challenge you to upload a video where you sit in the back seat or blind folded while the car drives for a few hours.Where does that figure come from? Most disengagements aren't safety-critical anyways, in my experience. Mostly comfort issues, not getting honked at, or missing a turn which would then add travel time on re-route. None of those things really have to be perfect to get the job done in a basic sense.
The number has been used by experts, and typically humans have an accident about 1-2 times per life time on average.