Again, did you watch the video? He did a very good job of pointing out how Brooks deconstructed the classic western.
Yes, I watched the video. Yes, Brooks did a good job of making a send-up of the western genre. But the movie was meant to be a rebuke of racism and its ignorance, among other things. At least according to Brooks, who says he wrote the movie out of anger at white corruption, racism, and Bible-thumping bigotry.
When Brooks asked Richard Pryor, one of the writers, if they were using the "N-word" too much... well, here:
“When I thought it was getting to be too much, Richard said, ‘No, we are writing a story of racial prejudice. That’s the word, the only word. It’s profound, it’s real, and the more we use it from the rednecks, the more the victory of the black sheriff will resonate.’”
So, to say that the point of the movie was to "destroy the western genre" absolutely misses the point of the movie.