Yes, Dr. Fauci "Changed the Goal Posts"...but only because COVID changed...we dance to the virus' tune here...always.
Here's another article in that topic, with a better description of what's going on....https://www.nytimes.com/2020/12/24/health/herd-immunity-covid-coronavirus.html
Bottom line...ALWAYS trust Dr. Fauci.
Link: https://pubmed.ncbi.nlm.nih.gov/34612165/