Interesting. I would argue that an author choosing CC0 instead of using a CC license with an ND (No-Derivatives) option demonstrates that an author has expressly waved "moral rights" through rejection of that protection.
Of course, my view may be biased since "moral rights" are generally not recognized here in American law. (With the exception of a few specific clauses in federal copyright law and some state statutes that have yet to be tested in federal court.)
As someone who releases free-to-use assets, I must say it's always best when you include a clickable link in the game credits. Then, if someone really likes the music, they can navigate to the artist and see what else they've made.
