At the same time, any effect like this would likely be present to an equal or very similar degree in any measurement of DV among the general population, so while it could be harder to confidently report an absolute figure, you could much more confidently compare them relative to each other (such that you can easily refute “three times more likely” claims like in the OP).
Yeah, that is definitely a newer development. I’d bet the vast majority of men’s rooms that have them didn’t get them at the same time as the women’s rooms, unless the building itself is fairly new construction.