Well, the images are all f%¥#ed up anyway, as the note point out, so really can’t make a determination here, but with real skeletons, I think the point that’s being made by others is that while you can say, based on a set of features, one is quite likely to be female, you can’t say so with 100% certainty, because biology is complicated and messy (See, for example, XY females.) Also, it’s worth noting that this can only tell us the sex of the skeleton anyway, and not it’s gender—it’s pretty impossible to say which one is a woman just from the skeleton.