Asexuality is a form of queerness. Ace folks are hunted down in part because of their queerness. What your asking is no different than asking if a cishet-passing white trans woman is still queer. Someone might have cishet-passing privilege but they're also still queer.
Furthermore, aromantic people are also valid and a part of the queer community.
I'm not sure I'd agree that ace folks are "hunted down." Please provide a citation. There's always jokes about the "crazy cat lady" and the like - there's absolutely social stigma due to living a life of solitude. And it's damn hard for someone who feels no sexual desire to maintain a relationship with someone who wants to have a sexual aspect to the relationship. But beyond that?
Edit: To make it clear, I dated an ace-identifying woman when I was younger, so it's not like I have no experience with this community.
I mean, as an an analogy, are all poly people queer, even if they are cishet? They face some of the same issues regarding societal expectations as ace/aro people have. The world at large expects them to pair off, and most people who date expect an active sexual relationship with one person. Seems very similar.
What about people who have fetishes which aren't "vanilla" but are cishet? Are they queer? If you have a foot fetish, are into bondage, etc you will have a hard time sustaining a relationship with a "vanilla" person, and are probably the butt of jokes. Does any kink make you queer?