There is a mistake here.
The test for a Navi is not a faher on shas. It is to see if he can foretell what will happen. It seems that those who hear him prophesizing are the ones who test him.
Another mistake.
Chabad is not or did not try to establish their rebbe as a navi. This came up as something he said which some posters think is off the rails. It’s a mainstream idea. Just that the rest of us don’t delve into these concepts. And we don’t speak publicly about these topics.
If you want to get on Chabad because of our taboos, you have to acknowledge that silence doesn’t mean dissent. Otherwise, your just disagreeing with yourself.