I also take issue with that. Certain age/gender/race profiles tend to fair worse than others in the interview process. Think h1b visa abuse.

For example males tend to have resume's which over qualify oneself vs females. Asians and Westerners also have these kind of differences.

This causes the rate of resume to hire to be different for different demographics.

Generally though interview feedback will state the facts and can be pulled up to back a companies actions. This is what needs to be judged.

I take issue with that. What if it's graduation time and a whole group of graduates without experience decide en masse to apply somewhere. Or lets say a group of retirees are given an assignment to liven up their lives and apply at places they would not normally consider. There are reasonable expectations.

It's more complicated than that. Even given that there is no demographically inherent advantage (something I generally believe), the hiring process is only one of the last steps in a long pipeline that can be damaged earlier on to skew the ratios.