...Technically, no, it isn't. Technically, you have to be baptised to be a heretic, even if you say the exact same things. Personally he doesn't see why, but one of the many qualifications he has is being the sort of person who will actually respect technicalities no matter what he personally thinks.
He isn't doctrinally required to be happy about it, though.
"Curiosity is not a sin." It damn well should be. "Quite the opposite. We are commanded to learn." Not in the way wizards insist on going about it, though. "Be careful, however. The world may be moved for good or for ill."
He isn't convinced there's been a good invention in seven hundred years.
"The existence of the soul is multiply evident. You can comprehend not only a high mountain, but height; not only a heavy stone, but weight; you can comprehend the immaterial, and must therefore yourself be immaterial. You can moreover desire knowledge, as you do, or love, or justice, none of which have merely material substance. You can in fact encompass Spells, which have no material existence. If you cannot comprehend such lemmas, consider then that a wizard transformed by magic, such that the accidence of the body is entirely different, remains entirely the same person. Do you understand?"