i think he meant it had no direct affect on a vast majority of people. Going simply by hard numbers thats pretty true, in every nation, for all of known history as is shown by the fact thay even before modern medicine not that many people died from hiv compared to, say, the flu, hunger, or other common woes. If you get hiv its EXTREMELY bad, and its more common than a lot of other high lethality diseases, but there just arent that many people directly effected.
I dont think he really meant it didnt matter. I think he more or less meant if not for media most people wouldnt really be as fixated on it as they now are and that it took a while for anyone to take it seriously. Because it just never really bore down on the population like a potentially civilization-ending problem so no one was afraid of it on a level proportuonal to that. And media had not yet drummed up a panic for it.
But thats just a guess. I cant speak for him. I could be really far off.