No, the point is that a statistically significant discrepancy between the number of people of a partical social group in the general population and the number of people from this group occupying a specific desirable job absent of other factors is a very strong indication that this group is being discriminated against.
It is, but the phrase "absent other factors" is convenient. It's upsetting to nearly no one that physically small NFL coaches are rare, yet the development system that produces NFL coaches inhibits the ability of those persons to advance to a head coaching position, despite them being, in theory, equally able to coach. Is that structural inhibition a factor to be absented, or a systemic problem?
(Or are small coaches excluded because they aren't taken seriously on the basis of something they can't help, but which wouldn't inhibit their job performance, excepting the reactions of prejudiced players and staff? We don't consider smallness a racial characteristic, despite its heritability, association with ancestry, and propensity to be met with prejudice, but discrimination because of size where it doesn't matter is the same evil as racism.)
That was clearly the status quo before this rule was instituted. And if you say as Mr. B does that that is not a problem at all, than I'm seriously questioning your motives. Or what's your explanation for the lack of black NFL coaches?
I would suppose that there are two problems: racism and educational imbalance (itself caused largely by racism, both historical and current). Some cultural factors regarding the adoption of racial identities may also play a role.
But, again, I think you've misunderstood
Mr. B. He doesn't say that there is no racial problem. He says that the problem isn't that there have been - and are - few "black" coaches, but that prejudice is affecting hiring decisions - it is the reason that we see and have seen so few.
It seems like they should always have to interview, whether it's a minority in the position or someone else. Maybe just say that they are require to interview multiple people for the job, and one needs to be from a minority background.
Ideally, a hiring system intended to fight racism would be indifferent to physical prejudices. Perhaps the identities and physical appearances of the candidates might be masked somehow. The Air Force has ceased using promotion photos to avoid unfair advancement of more attractive persons; modern technology offers some possibilities for other appearance-blind promotion systems.
Are we to care whether someone has unattached earlobes or attached earlobes merely because some persons think that the kind of earlobes defines the kind of person? All concepts of race are no less ridiculous.