Nope. Never said that.
What I did say is that when you have a white guy playing a black character who is only written by white guys, that's not "the real thing." That's a bunch of white guys' fantasy of a black guy.
Having representation on the writing staff and in the cast is a moral obligation. That doesn't mean that only black people can write a black character. But it does mean you can't only have white guys running the show.
It's almost like maybe they should have people who are not white both writing the show and acting in it!
"Hey, your show should not just be made by white people and should not only be about white people" makes perfect sense unless you think "white" is the default setting for the human species.
I agree diversity is a good thing. But even with a diverse writing staff if the show was created by a white person you still got one person at the top whose voice carries the most weight. In this case it would be Seth McFarlande. It still doesn't matter though who voices Cleveland.
You measure progress in terms overall representation in the industry and equal pay for those with comparable experience within each area of jobs. Like if you have 50 writers with 4 to 6 years experience who are white and lets say 46 writers for non-white writers with 4 to 6 years experience then the overall pay should more or less be equal. You can't measure progress going from one specific show to the next because their are always specific issues within each show that effects the metrics.