I don't really understand the argument that employers should recruit absolutely fairly. Humans are always biased. If there was some AI based solution that would

I don't really understand the argument that employers should recruit absolutely fairly. Humans are always biased. If there was some AI based solution that would deal jobs absolutely fairly it would negate this, but there isn't, so the only alternative to smart human based hiring is dumb bureaucracy based one. The large scale discriminatory criteria of gender, race and age should be accounted for but beyond those constraining who you should vouch for sound extremely constraining. I understand the argument, and I think the effect you suggest is plausible - I'm not just convinced it's such an effect that could or should be accounted for (mainly because I have no idea what process beyond blind bureaucracy could do this).