This article has a pretty good outlining of the claim, explanation of how the 12% came about, and weaknesses in the argument and provides all the sources including the released documents. Take from it what you will, I don't got the time for 280k pages or whatever we're up to now on mystery goo, I declined that shit the moment they were like "it's new untested technology, everyone should get it". Maybe when Comirnaty is on the market in another 2.5 years and I've been dumbed down by society enough to say "sure seems a little bit cold this year, better get my 50 mrna vaccines, wouldn't want my 3rd head to lose its ability to smell or my 2nd head to have a fever"

https://www.covid-datascience.com/post/do-the-recent-80k-pages-of-pfizer-documents-released-really-show-vaccine-efficacy-was-only-12