Is there any proof of this at all beyond this random message?

Yeah - it does feel a bit overly dramatic, books mentioned from a potentially related article are from like 2018 (https://nltimes.nl/2026/06/25/rare-book-dealers-fear-tech-fi...). Let's not pump the drama more than we need to, Sam Altman made another mention of the singularity over the weekend so enough of that going around.