Also, I know people in minority groups who are fantastic at their jobs and have had year-plus job searches.
The "labor shortage" is bullshit. So many good people can't find decent jobs even today, and wages are still hilarious low compared to the outright robbery that capital gets away with.
That being said, I don't think it's necessarily because of conscious racism, sexism, or ageism that companies tend to end up redlined. It has a lot more to do with the fact that managerial decisions are made based on motives that have little to do with business at all. Silicon Valley ageism, for example, doesn't exist because middle-aged men think young people are all geniuses. (Trust me, we don't.) Rather, it exists because the subordinate's job is to make the boss feel young again, to be the Jesse to their Walter White. It has nothing to do with the needs of the business, but it also doesn't get in the way of the business, so it's not likely to be changed.