"This includes a study that analyzed the exact same brain data from the original study and found that the sex of a given brain could be correctly identified with about a 70 percent accuracy".

Well, in today's politically correct world, a score of 70 percent accuracy at identifying something, it does not count for much.

An example? Take a randomly selected Canadian, and have that Canadian meet a thousand randomly selected Canadians over the course of a day.

Have that Canadian classify each person they meet according to race, as in white, black, eastern Asian ("oriental"), southwest Asian ("Indo-Pakistani"), Inuit/Native, and uncertain.

The average Canadian will probably get a score of over 80 percent correct on those thousand randomly selected people. 

Except that races do not exist, and numerous scientific studies have said so. They are a figment of social constructionist imagination.

Not bad, the ability of people to recognize over 80% correct something that does not exist.