Duplicated content not only is not good, but it is bad and it can cause you a penalty. There might be more than what you are seeing from this site that is making it rank so good. Probably a lot of automatically generated dynamic content.
I wouldn't call "authority" site until I have at least 20 1000 words articles on a subject. I think you can be sure that you have an authority site when you start seeing natural links that people post on the web quoting you as the source.
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