I read their comment as the teacher (who was correct) and a tutor (who used AI) disagreed, not two tutors.

With the amount of blatantly false information I've seen LLMs spew out in response to my very simple questions, I can very easily imagine one would get this basic information wrong somehow, although I did just Google it (as Gemini, and particularly the on-search-result-page version of it, seem to be the absolute worst of the common models in my experience), and it did get the answer right.