Part of the problem is that there are a number of completely orthogonal ways to aggrieve an author: Infringement of Copyright, Infringement of Moral Rights (droit d'auteur, unauthorized alteration of the work or attribution), Plagiarism, Breach of Contract, etc.

Here he's asserting his Moral Rights. Alteration is covered in the US by All Rights Reserved as it'd be a derivative work, but you'd have to lean on trademarks and libel/slander to fully enforce your rights regarding attribution.