Bill Lawrence removed episodes because he and the cast hated that for years after they'd see people at halloween dressing as the characters in blackface, and realised that people were taking the wrong message from the episodes they'd made which were meant to mock the idea of people thinking it was OK to do blackface.
That isn't self-censorship, it's accepting that your work didn't read the way you wanted it to and deciding it's not worth having it out there under your name any more.
Freedom of speech also includes the freedom not to speak, and people should be allowed to say "I don't like this work of mine any more, I'm not continuing to publish it". If you advocate for enforced speech, you are the censor, just using a different tool.
That isn't self-censorship, it's accepting that your work didn't read the way you wanted it to and deciding it's not worth having it out there under your name any more.
Freedom of speech also includes the freedom not to speak, and people should be allowed to say "I don't like this work of mine any more, I'm not continuing to publish it". If you advocate for enforced speech, you are the censor, just using a different tool.