Humans tend to make models of everything. We even have our own models in our head that ease our way through life.
The models pointed in this book are biased. And that is because they are modeling a system that is biased. They only reflect the view of the world of the people that design them. It's true that they are unfair, but because the capitalism is an unfair system.
I agree with the author in that we must be vigilant and fight against this discriminating models. But I think that this tools only make the unfairness of the system more efficient. The problem is deeper than the tool, we must fight the system for a better and more fair world.