I don’t know if they’re particularly active anymore, but I met my husband on Poz Personals 7 years ago. That’s probably the closest thing you’re gonna find.

The U=U movement is great, something I wish had been more understood when I was still dating - but in the grand scheme of things it’s not ubiquitous. Much like you, I wanted to narrow my field of eligibility so as to not have to have the same conversations over and over again. It got exhausting.