This was interesting. A January 06 interview with Isaac Hayes and he didn't mind too much about the episode in question.
http://www.avclub.com/content/node/44132
Here are the pertinent snippets
Interviewed by Noel Murray
January 4th, 2006
AVC:
There's some pretty harsh satire on South Park. They don't really care who they offend.
IH: But that's their thing! They're success was built on that cutting-edge stuff. I've had to defend them a lot of times. One time on BET Tonight I defended them because Tavis Smiley, the host on that show, was coming at me. It was a call-in show, too, so people were calling in. I told them not to take this stuff seriously. If you do, you'll get in trouble. Just enjoy it. Remember your high-school yearbook? You look at those pictures now, you laugh, right? That's what South Park is. You got to laugh at it. Because we cursed, but we just didn't dare let the principals, the teachers, or the preachers hear it. And we didn't turn out bad, okay? Just look at it that way. Also, usually there's some kind of moral message at the end for the kids, by the Chef.
AVC:
They did just do an episode that made fun of your religion, Scientology. Did that bother you?
IH: Well, I talked to Matt and Trey about that. They didn't let me know until it was done. I said, "Guys, you have it all wrong. We're not like that. I know that's your thing, but get your information correct, because somebody might believe that shit, you know?" But I understand what they're doing. I told them to take a couple of Scientology courses, and understand what we do. [Laughs.]
_____
When I read interviews with him, I picture Chef.
BTW.. those Scientol ogy people are in the malls now too. NICE