They aren't using it, no, but that doesn't mean the scientific method can't study what they do and come to an understanding of it - probably a better understanding of it than they have, since as you say, they aren't using it. It'd just take a few decades of study probably to have a much stronger understanding of how it works.

My point is just that people draw this weird line between 'science' and 'magic' as though they were incompatible. In a world in which magic is real and useful, science can study it.