I would assume the diverse hiring pools come with candidates that are not as qualified as the other pools. That's the flip side to this.
Do business hire from specific pools for biased or performance reasons? I think the assumption is that all hiring inequality is the result of bias. What if it isn't?
I believe that Pursuit.org (started by StackExchange) is like that.
NOTE: I am not connected with Pursuit. I did consider working with them, but they weren't interested in my specialty.
Also, a couple of felon-assistance outfits have been mentioned on HN. If you really want diversity, that's a good bet.
It's not like there is a large pool of black developer talent that firms just keep missing. It doesn't exist. It could be created, but a separate and totally valid question is: why do that? Why should we want every group of people to be representative of the population down to the smallest scale in race x gender x sexual preference?
Naturally it ends up being a mess of contradictions and confused thinking, because everyone has to pretend to ignore the obvious root cause.
Given that Twitter takes an active role in censoring particular ideas, I think it's worth being careful to distinguish "Twitter has decided this isn't allowed" from "a lot of Twitter users have decided this isn't allowed".
If your indeed job posts didn't bring diverse candidates then, why do you think it would now? Because you added a "Please apply if you're DiVeRsE" line to it? Don't be ridiculous.
If you want diversity of candidates you can't keep going back to the same talent pools. You have to diversify where you're drawing talent.
If your college program is primarily getting white/asian males, you can't suddenly expect it to start throwing in women & poc as well. You can't suddenly expect it to start giving you LGBTQ+ candidates.
If you want diverse candidates, you have to look at diverse hiring pools. Look at the bootcamps that focus on diverse groups you're targeting. Look at schools that focus on diverse groups you're targeting.
If you're really interested in diverse candidates, you can't keep expecting them to just show up if you add a "We want diversity!" to your job description - you have to change where you look for them.