He did attribute it to MLK, but ultimately it's a biblical reference (Moses & crossing the Jordan River). Those are usually OK in a variety of contexts.
It may originally come from the Bible, but that line is indelibly linked with MLK. I agree with rauljara - that headline is tone-deaf and tacky, though the article itself is well-written and informative.
I don't actually disagree, but mostly in the sense that it distracts from the point he's actually making.