You think a single story to the contrary constitutes proof of this? Pfffft!
However, if you bother to do the research you'll find that the practice predates Islam. You'll also find that it is practiced in the area by people who profess religions other than Islam, amd this story draws attemtion to that. Whether Islam officially recommends or condones this, or whether it officially condemns it but turns a blind eye to it is not known to me. But it's not unique to Islam, and this post (and the story as a whole, if you click through and read it) makes it clear that this is a cultural construct of the area, not a religious one, and has nothing to do with Christianity either