> Both dosings use two shots, and the "90%" number from the smaller dosing is from an unreliably small sample set of 33 infections."

Can you count infections as a metric of efficacy for a vaccine that's designed to stop infection?

Consider [1]:

"However, protection was 90% in an analysis of around 3,000 people on the trial who were given a half-sized first dose and a full-sized second dose."

AFAIK it's not known how many of those 3,000 in that trial were exposed to potential infection.

[1] https://www.bbc.com/news/health-55040635