If this works it will be the end to an era of fear. Many will remember those that where lost and wish this only happened sooner. A new reason to celebrate is underselling the impact this will have.
But on the other hand we are just talking about celebrating this. I feel like those sub-communities are probably more aware of the impact HIV than the average cis straight person and are probably going to celebrate this as well.
I don't get what's insensitive about it at all so maybe I am missing your point.