At some point there was some PR about 100% effectiveness of the product on kids, according to, the guys who actually manufacture the product :)
https://www.pfizer.com/news/press-release/press-release-deta...
https://www.pfizer.com/news/press-release/press-release-deta...
Also that press release is not by any possible definition from “early days” nor is it issued by Dr Fauci.
Now, I invite you to make google searches with a date range and you will see that such studies claiming 100% efficacy on the product on kids started to appear in the early days actually:
https://www.pfizer.com/news/press-release/press-release-deta...
Since 100% is a pretty awesome figure, my theory is that there must have been quite a bit of press coverage at the time and I have no doubt a lot of people got confused.