Yep.
Two homosexuals engage in unsafe, unprotected sex? So where's that "stigma" thing between them or in their thinking? Stigma would be a good thing, after all, and a marker for caution and care. Removing the stigma from them, in their decision making, IS the "barrier to HIV prevention...."
Stigma exists for a legitimate reason. You can’t “wish it away,” and you can’t “legislate it away” without fascistic bloodshed.
Illegitimate stigma will right itself if the basis of the stigma is ultimately revealed to be illegitimate. If it doesn’t, the object of the stigma has earned it.