Reading the book's blurbs and Kiser's descriptions I don't see anything about the book claiming m/f/intersex brains are all neurologically _identical_ in their

Reading the book's blurbs and Kiser's descriptions I don't see anything about the book claiming m/f/intersex brains are all neurologically _identical_ in their developmental origins and trajectories... just that they aren't "gendered" (e.g. aren't structured in ways that cause tropes or stereotypes) and that there are many old myths related to the genderedness assumption in brains to be debunked. The Amazon description indeed reads "A breakthrough work in neuroscience—and an incisive corrective to a long history of damaging pseudoscience—that finally debunks the myth that there is a hardwired distinction between male and female brains" -- but it's basically a 0% that the author wrote that bit!