You're right Mark. This doesn't seem obvious at first, but when you click on the author's link in that website, you get this:
Quote:
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Posted in External Content, Robotics | Leave a comment | Retrieved from Chief Delphi. You might want to view the original article for more information, to leave a comment, or to contact the author.
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Therefore, the username only posted in CD, the STEMroots website just archived it for some reason, it even provided a link to this topic.