Dr. Seuss, check out the info at identifyingchaba.org and on the wikipedia page about messianic chabad. Then tell me that this was an isolated slip of the tongue.
Moshe Rabbeinu’s grave was hidden so people wouldn’t daven to it. So yes, if someone said Moshe runs the world, it’s avodah zarah. Hashem hu ha’elo-him.
Many chabadskers say tachanun on 3 Tammuz, even though they skip tachanun on the yartzeits of every other rebbe. The “LChaim” newsletter says ‘the Rebbe shlit”a’ 17 years after his passing and has a section called “living with the Rebbe”. He said what he meant and he meant what he said.