True, and he has been involved with many phenomenally creative projects over the years so he is someone to respect, especially when it comes to the Muppets. However, just because he says it doesn't mean it's true. The direction of the TV show was awful. The first of the new Muppets movies was great, the second....not so much.
There YouTube presence a few years ago was pretty in keeping with who they are, and the stuff in Liberty Square is fun. Hopefully, they can right the ship from the TV Show and the last movie in the future.
Like I said I have a lot of respect for Oz and his contributions, but it's not like he hasn't been involved in some duds in his time. His record as a film director is a case in point: some great (Bowfinger, Little Shop), some not so much (The Score, Stepford Wives). It is his opinion and he is entitled to it as it is a very personal subject to him, but I can point to a lot of examples in which original contributors/creators were locked out of the "reboots" or continuations of their work and were bitter and angry, yet the product was still good.