The article is worse than you are portraying it. They go out and tie Murray to Alexander then in the next sentence remind the reader Murray is a racist.

"In one post, he aligned himself with Charles Murray, who proposed a link between race and I.Q. in “The Bell Curve.” In another, he pointed out that Mr. Murray believes Black people “are genetically less intelligent than white people.”"

You say "Metz doesn't call Alexander a racist", but that sentence is clearly trying to get his readers to think that.