It sounds like White Evangelicals are broken out separately from White Protestants, while Black Evangelicals are not.
If by White Protestants they mean Episcopalian/Presbyterian USA/ELCA, I can understand why they’re separate from White Evangelicals.
Hmmm. If I was a black protestant I might the find the "well all those black churches are alike anyway so we'll dump 'em all into one category" argument a teeny bit offensive.