It’s not necessarily surprising, more like… interesting? There are so many superstitions when it comes to differences between sexes. It is good to read something real science-based on these topics. The question is, how good of a research this is, though - it’s always good to check.

What you say about averages is true, but it can differ a lot. There can be characteristics in which the groups overlap so much that the effect is impossible to observe IRL. There can also be characteristics that overlap so little that it’s an obvious difference - I believe muscle growth and physical strength is an example of the latter.