The HIV conspiracy theory came from a supposed hack of the WHO posted on 4Chan and Kiwifarms back in April 2020.
The claim at the time was that China had been trying to build a viral cure for HIV to enable them to fully take over Africa.
It was disproven in like five minutes because we knew at the time that COVID contained no genetic material from the HIV virus.
Edit: unless I'm mistaken Fauci's emails weren't leaked, they were released through FOIA with the expected redactions.
Apparently literally anyone could email Fauci which explains why he got stuff from weirdos like this:
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Just from skimming the #Faucileaks hashtag for a few minutes I'm seeing a ton of wacky new conspiracy theories like the shutdowns being a scheme by blue states to steal money from the federal government and Fauci somehow being behind Cuomo's retirement home scandal.
The actual emails provided make him sound completely reasonable.
You'd think the redactions would clue them in to the fact that these aren't leaks and if Fauci and Xi secretly worked together to kill millions of people the government would never freely publish evidence of that in response to a FOIA request.