This is a particularly good quote to sum up the article. The internet is not a repository of facts, it is a repository of facts, spam, junk, and things. Moreover, it is not the only repository of these.
Link rot happens. Content is subject to the will of the publisher to spend the time and/or money to continue to host it.
Depending on links to work eternally is a mistake. The problem is not the link rot, it is the bad assumption.