It's important to note that the recommendations are an *attempt* at a bias inversion while maintaining affinity to the searched title. And gender in the literary space, is, curiously, along a spectrum. So indeed it might be the case that Oliver Sacks is less "male"-biased (as an author) than the likes of Sam Harris or that Jordan P fella (ugh). I see in the recommendation set, tho, that there are some notable female authors, so I shan't consider it an utter failure :D
Worth noting as well: the authors' genders are not noted manually. From the implementation notes:
> Over 150,000 books have been given a very approximate score based on the names of the authors (compared against 80k locale-specific names) and the frequency and density of pronouns used in descriptions and in many millions of reviews of the books. This gives a very broad picture of the gender-bias space, but obviously lacks accuracy for any specific title. Nonetheless it enables us to build a general picture because books tend to be in "affinity spaces" with similar books. You can read more about how recommendations are made in a general sense on abooklikefoo.com as this uses the same backing data and hueristics.
EDIT:
> So not fixing bias but just creating more bias
I have .. opinions on this (Miles-long screed in which I navigate the topic of how best we go about creating more equitable systems where previously systemic biases have held sway for so long. /... years later after we gather to read libraries of reflections on affirmative action and positive discriminations.../ we border on agreement that perhaps it's ok to counter a 95:5 bias with 5:95 and not be too perturbed :p)