Chabad uses the “you don’t understand” with satmar, and other chasidim who very much do understand their language, including litvaks like me with a background in chasidus.
There’s no mention in the tanya of a rebbe being the essence of god (atzmus elokus is a term in chasidus for Hashem himself, all over) wrapped in a body, that he is omniscient, omnipotent, omnipresent, and fit to be prayed to.
If there is kindly show us.
What they’ll use as “sources” are the lubavitcher rebbe’s own writings.
It’s like debating with a Christian who tries to prove himself right hsing the new testament.