There are three questions there.
I use multiple terms. Multiple terms are used within the sex industry—it's part of its diversity—so I will flip back and forth between those terms. I don't think the sex industry is homogenous and that I can use one term to describe all of it.
I don't think screening has to be 100% effective to be a tool that sex workers value and saves them some of the time. I don't think that should be the condition on which we evaluate screening.
As for our being a small group, I don't know. Various claims have been made about the “vast majority” left, right, and centre over the past week. I think we belong to a sizeable group and a group that deserves a voice as well.