How the hell did he arrive at the conclusion there was some sort of one-drop rule for non-protected works.
Just because the registration is blocked if you don’t specify which part is the result of human creativity, doesn’t mean the copyright on the part that is the result of human creativity is forfeit.
Copyright exists even before registration, registration just makes it easier to enforce. And nobody says you can’t just properly refile for registration of the part that is the result of human creativity.





I suggest reading the first paragraph, it addresses your point.