First off, thanks for that. To think that any random stranger on the internet "must" do something for you... well, that's quality humor right there.

and separately and individually to any other person who asks it of you, a minimum of five credible primary sources of people who advocate diversity and who have used exactly this phrasing

My guess is that he's capable of original thought, and this might be one of his original thoughts. Not everyone builds a facade of intelligence by regurgitating quotations from other people. Because someone else hasn't posted something on the internet doesn't mean it's not a valid thought.