It isn't the data that's biased. If you're hiring a computer scientist and disproportionately few black people have a degree in computer science, the data is not lying about who the qualified applicants are and the algorithm can't change that.
To fix that you have to cause more black high school students to go to college and study computer science and then wait two generations until their proportionality in the installed base of qualified computer scientists reaches parity. There is no magic wand that makes it happen overnight.
But concentrating on the places where it can't be solved instead of the places where it can will make it take even longer.
