Because 'manuscript' means hand-written. LLMs think if they write it enough times, it'll become true. Then they'll grow hands and then not only will RAM be in short supply but keyboards too.
Double suicides happen all the time around the world and are extensively documented in literature (Romeo and Juliet being the prototypical example). That doesn't mean it is a "tradition".
The only instance of tradition on that page says it is contained within plays and literature. This is different than saying that the actual act itself, in real life, was a tradition.
I did not read this article.