The Gemara says why it was wrong: ????? ???? ??? ???? ????? ????? ????? ?? ????? ???? ???, but it wasn’t a violation of a fundamental belief, because he didn’t deny the geulah, but, as Rashi says, he thought that Hashem will be the goel. Yanklowitz says it’s all some vague metaphor, chalilah. He is an apikores, and there is not even a rejected opinion on his side.
I’m not arguing with you, I’m just pointing out that you don’t need to bring the Mahara”l; it’s a Gemara with Rashi (I am arguing with your first post on this thread, but it seems you’ve retracted).