I’ve heard the AIDS story too; invented in a top secret Maryland lab to kill blacks and homosexuals. Also heard that after slavery is brought back, those blacks not strong enough to work would be taken to concentration camps and killed.
Along with Rove and Bush causing nine-eleven, these stories are widely believed among the poor and ill-educated.
Since AIDS is a behaviorally spread disease, this is a comment of the left's own perception of the behavior of blacks.
That's only half of it. The other is that the advice to use condoms is part of a genocidal plot to wipe out minorities. (By preventing them from reproducing.)
IIRC, it was the CDC that did a study about a decade or so ago about all this. It found that this wasn't a phenomenon that could be blamed on lack of education; something like a third of well-educated blacks believed this stuff.