Is one who has fallen into a doctrinal innovation, but whose methodology is that of the people of the Sunnah, considered an innovator?

Question:
He asks: Is one who has fallen into a doctrinal innovation, despite being known for adhering to the methodology of the people of the Sunnah in everything, but who has only fallen into this innovation, considered an innovator, or is his entire methodology taken into account?

Answer:
Yes, he is considered an innovator if he does not repent and abandon the innovation; he is an innovator even if it is only one innovation. Yes.