The national CFB media are eating it up. There are some counterpoints that suggest TCU and Nebraska aren't any good, but that's a small minority. You can only change that narrative until they finally lose, which makes it a rather winnable argument. "USC and Oregon are going to roll them." The team with the wonky defense and.....Oregon. I mean, sure, yeah.
I don't know that many people were saying otherwise a month ago before they doubled their win total from last year? I didn't see anyone pick them higher than 9th or 10th in the conference.
As for the creation of doubters and haters, it's become an art form in American Sports Culture, especially in all levels of football. I don't know of anyone who has mastered this art form as much as Deion Sanders has, and he's done so in a short amount of time. Win or lose, I hope people keep provoking him.