By definition, we don't know about the incidents that have not yet been detected and once we find out about them they're no longer undetected and so don't qualify as proof under your standard. Also, there are several entries on the list that hung around for 6-8 years and made their way into publications like scientific journals, books, and obituaries that are effectively going to be around forever.

One particularly embarrassing example on the list involved a real person being falsely accused of taking part in a major points shaving scandal in college despite not even being on the team at the time, with multiple major publications repeating the claim. It was only discovered after 6 years or so because a film reviewer got an email claiming he was omitted from a film about the scandal because he wasn't even on the team, and believed that person enough to start digging despite all the coverage insisting otherwise: http://awfulannouncing.com/2014/guilt-wikipedia-joe-streater...