The point was not that modern anti-racists are wrong because they disagreed with MLK on some topics, it was that they are wrong because they completely reject colour blindness, of which MLK’s famous statements are one well-known example. Perhaps I should have picked a different person or just not mentioned him.

Again: It’s about the specific idea, not a person. And the idea is what is being hijacked, to mean almost the opposite of what was generally accepted.