Their supplemental index seems to bear this out. Remember, GoogleBot ignores all the markup and only looks at the text ... so it would be a lot easier to find duplicate content this way.
Do you belive that google can find duplicate content?
Maybe you should just read the two pinned threads at the top of this category
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A foolish consistency is the hobgoblin of little minds
Thought for today:- Is SEO the only industry where all the cowboys are Indians?