> They referring to https://en.wikipedia.org/wiki/Wikipedia:Requests_for_comment... ?

Wikipedia does not have a project page with this exact name.

I assume that is weasel words for 404 Not Found.

You seem to have truncated the link; it appears in full for me in kay_o's comment.

I did not. The link was susequently edited.

To https://en.wikipedia.org/wiki/Wikipedia:Requests_for_comment...

I read that up to the first "proof", https://web.archive.org/web/20260218135501/https://www.googl...

It lands "503 Service Unavailable No server is available to handle this request."

Apologies, then. The Wayback link works just fine for me, no errors.