If there's a central theme to this thread, it's different people using the same (or similar) words to mean different things. It's a shaky basis for discussion.
I don't necessarily believe that they mean different things. Yeah we seem to have several acronyms going on. I settled on IT (internal training) as the one closed to my current understanding. As that grows perhaps I'll find a different way to name it.
You asked some questions. I answered them from my POV. You have not yet answered mine.