I’ve seen Disco have to correct people in a live stream making comments like, “that’s not a dev, they can’t answer that question…”. So yes, it does happen.
I don’t believe I’ve ever referred to anyone as “not a dev.” I firmly believe that ANYONE that contributes to the development of a game is a dev. I correct people when I say not all devs work on all features, as in, “Such person doesn’t work on that feature you’re asking about, so they can’t answer about it.”
That should never be taken as me saying they’re “not a dev.”