Adding the single word promote makes the post entirely an on-topic reply to what he said - white men are not discriminated against "because diversity"; and if they are the exact same legal recourse used by protected classes is open to them.
But since you think I didn't answer their post: what do you think they were talking about?
Do you think that "promotion" is somehow not part of "recruitment and selection"?
Of course it is. They are also known as career-advancement opportunities or whatever you want to call them. But they are most certainly part of recruitment, along with all the other possible benefits the company has to offer.
To be honest hiring or promoting is probably similar so I wouldn't bash him.
It's just unfortunate that the way we "fix things" is never fair. I'd rather we be transparent in the hiring, promoting, and salaries. I'd rather we attempt to fix the social pressure issues.