IANA's email about why example.com changed - https://news.ycombinator.com/item?id=49915060 - Sept 2026 (20 comments)
McCarthy of DebugBear clearly noticed this admonition and perhaps the mistake as well, because they have carefully highlighted "example.com" without linking to it, although they apparently have visited the site in order to copy and cite screenshots and unpack the CSS, and describe an extensive history of it.