Thank you for being one of the only people to bring up the point of the article. It means the actual citations not the work being cited. However, as the articl

Thank you for being one of the only people to bring up the point of the article. It means the actual citations not the work being cited. However, as the article points out, it is possible (perhaps even easy) to hunt down updated links to the research. Instead they were deleted. If that was done to a Wikipedia article the article would be flagged and either the text deleted or the link fixed. So in a sense Wikipedia has much higher standards. If anything this is a fable of SEO. Why you should always make sure your legacy URLs provide proper 301 redirects.