FSD's imperfections and supervision do not invalidate their fleet's size and its consequent ability to collect training data and statistics (eventually, deaths per mile statistics). The low fleet size assumption in the presentation is simply toast.
If I had claimed that the 500 million number indicated a certain level of deaths-per-mile safety, that would be invalid -- but I spent 3/4 of my post emphasizing that it did not, even though you keep pretending otherwise.
Yes, I'm addressing that point directly, specifically the fact that this "unthinkable number" is misleading regardless of the number's magnitude.