The title of the actual paper is "Some thoughts on security after ten years of qmail 1.0". The post currently has the made-up title "How to Write Software with Zero bugs – 25 years after qmail 1.0 – D. Bernstein [pdf]".
Sorry, that's actually how I jokingly refer to that paper whenever I quote it, I didn't know the title should match the link title exactly. Now I see why it's flagged