Maybe you think Fauci changed his mind based on new evidence on mask effectiveness, but he literally says they advised against masks due to a fear of PPE shortages, and not due to changing evidence. So either way he deceived: either he deceived about mask effectiveness thus spreading health misinformation, or he deceived about why he advised against wearing masks thus undermining public trust in his advice.

Fauci admits to moving the goalposts on vaccination rates and explains it's because of his "gut feeling that the country is finally ready to hear what he really thinks":

https://www.nytimes.com/2020/12/24/health/herd-immunity-covi...

I think public health officials like Fauci really shot themselves in the foot by undermining their credibility so early on. Public health officials in a public health crisis should be beyond reproach, but that's not how they've been acting, and continued partisan support of these figures only further deteriorates trust in scientific institutions and journalism.