I'm not saying buffet isn't a good example to follow. but the reason he's a good example to follow doesn't stem from his huge success.
I'm addressing the underlying error in thinking. It's like religion. Religion in general isn't the problem, it's a symptom of the underlying issue that people accept wild claims without evidence. Here too I'm sure a lot of people see Buffet's success and accept what he says without closely examining the claims.
You might ask "what's the point of seeking advice from people more knowledgeable than you if you judge the advice by your own inferior metrics?"
that's a whole 'nother discussion.