ok but the phrase is awfully ironic, did the author do this on purpose?
My general conclusion is that each academic discipline has its own means of discriminating against diversity. At first I felt that the book’s main message would be a catalogue of diversity that biologically validates divergent expressions of gender and sexuality. This validating catalogue is indeed important. But as I reflected on my academic sojourn, I increasingly wondered why we didn’t already know about nature’s wonderful diversity in gender and sexuality. I came to see the book’s main message as an indictment of academia for suppressing and denying diversity. I now conclude that all our academic disciplines should go back to school, take refresher courses in their own primary data, and emerge with a reformed, enlarged, and more accurate concept of diversity.
They went "back to school" that's the problem lady.