They probably know already most of their readers are in the science camp, so it's just catering to their base. Plus, as the other poster pointed out, it's a way

They probably know already most of their readers are in the science camp, so it's just catering to their base. Plus, as the other poster pointed out, it's a way to show independence from their owners. (Conde Nast likely just happy they're able to profit from both sides)