This is another example of the, let's say special properties of the writing in your source book. Usually, "victimise" means to treat somebody very badly, to bully, to abuse. Here, the writer is using it in the rare but possible sense of portraying the person as a victim, iconising the person in a victim role. Ascribing emotional depth to the Benetton advert seems like a travesty, to a survivor of that era: wasn't the depth, if there was any, all in the photo, long before Benetton slapped branding on it to fliog knitwear ...? https://time.com/4592061/colorization-benetton-aids-ad/. So, to answer directly, you could read this as showing AIDS sufferers as victims of unkind circumstances.