I don't think all of the examples are supposed to be worse on a moral scale, but simply worse in terms of creating "a false history that the characters were forced to act out for the sake of this movie" (from the article). So there's nothing wrong with being a Broadway star, or visiting Koozebane, or being Fozzie's twin brother, but as far as false histories go, they're pretty far out there. (What's less believable, Kermit in a mansion, or Kermit and Fozzie sharing a father who's a green bear with frog eyes and a collar?) I think the point is that there's no sense complaining about a false history for this movie when nearly everything the Muppets have done has had some degree of false history or out-there fiction.
Not directly related to that, but at least they almost gave Oz credit for saying that he didn't want to make a big deal of it. I really think he was trying to be diplomatic, but now he's made to look like the bad guy.