Corona Virus has been around for decades and immunologists such as Fauci have been studying it during that time, thanks Captain Obvious, Judicial Watch didn't uncover anything that wasn't known among immunologists.
He did not "lie" and pretend anything was new. Did he downplay it at first, arguably yes, but that quickly changed as they learned more about this new version that was spreading and killing at unprecedented rates compared to previous variants of it. As they learned, their recommendations changed and guess what, their recommendations will continue to change as the virus dies out or morphs into newer, potentially more deadly variants so prepare for change.
No, millions would not be alive, when the CDC changed their views and recommend that people distance and mask in Early March of 2020, only a few people had died in the USA (As i recall, it was 7 deaths in the first week of March 2020 in the USA), so your numbers are way off, hence why i say you have a narrative. When you are not fact based, it's assumed you have a narrative.
Fauci is a red herring at this point anyway, what will save millions now is getting vaccinated.