@rcz @darnell and regarding the "who are these people" – I don't think it's unreasonable to assume they do exist.
If they didn't, that would mean that every single person that is, according to the set of tests you believe exists, "female" has muscle mass and strength and bone density *strictly lower* than every single person that is, according to the same tests, "male".
That would be an immensely surprising, remarkable thing.