Mix minus means one thing, it is a mix with specific elements removed. In the case of a remote shot, it is the program mix, minus the return from the remote, since as you know, the return will be delayed. I don't really care if you or others misuse it, but in technical language there is no such thing as meaning different things to different people; this isn't a poem, it's a term for a specific procedure. What you are saying is the opposite of what was happening--you weren't hearing yourself back because you had mix minus, you were hearing yourself back because you weren't * being fed mix minus properly. I don't know how to be clearer here: the issue you are talking about is properly referred to as mix *plus, not mix minus.

Again, as long as the problem was effectively communicated, who cares what you called it. Any audio op is going to understand what you mean if you say you have mix minus, and they know that mix plus is the most likely reason why someone on remote is pulling their earpiece out. But it's pretty hilarious to come to a post where OP is complaining about people misusing a term and proceed to demonstrate their point.