Really? I'd say it definitely still counts as horror, though I could see how it would fit into the fantasy genre or psychological drama or even kind of historical drama as well.
A lot of stories aren't perfect fits into any one genre, or can fit into multiple genres, but that doesn't mean they don't belong at all.
Re: top 100 best horror movies
A lot of stories aren't perfect fits into any one genre, or can fit into multiple genres, but that doesn't mean they don't belong at all.