I skimmed through the article but wasn't able to find such.
What I read on diversity seems to make sense to me; that, if all other factors equal (degree and such), then you hire the most marginalized person. It might seem unfair (and on a micro level it might be) but on a macro level it is fair since the least marginalized personae are going to be able to easier get the job elsewhere where they don't prioritize the marginalized personae.
This almost never happens btw since HR looks further than degree. We also have the issue of old age (due to babyboomer dominance) and these babyboomers mean there's an ample amount of jobs available.
Also, you can exploit the unique abilities of a marginalized person. For example, their bilingual expertise (example being customer support) or their knowledge on LGBT issues (for example, a quest in a game involving such) or their first hand experience and/or literature derived knowledge on disabilities (for example usability issues with a product) or spot say (even unintentional) racism in the product (example being AI/ML)