Since I found out the freedom exception for art, I don't consider GNU nor free software distributions really free.
All free distros have to be entirely redistributable, among other requirements. I believe RMS is just saying that he doesn't consider it /unethical/ to distribute licensed non-functional works that disallow modification. Read about this here: https://www.gnu.org/distros/free-system-distribution-guidelines.html#non-functional-data
