European here, I will go over my surprise / weirdness about having ads for chronic disease medication like that, to ask : do you actually, you as the patient, choose which medication you receive for disease like that? Does your opinion override that of the doctor? Is it not ultimately a moot choice both by you and the doctor because the one you will get is the one your insurance covers?
I have a hard time reconciling what (little) I know about in the US medical system between insurance behavior, doctor choice, and ads aimed at patient choice.
I understand ads for non prescription drugs and little things like cough, but ads for HIV treatment I can't fathom.
As for your question, while the ad might be massively bad targeting for you, it might still be the best they have where you fit in the restriction set by the ad publisher, so better they get money on a poor match than no money at all. Usually a publisher that has terrible targeting.