No one does this. And Wikipedia myths spread to other media until it's hard to pinpoint where it started.

Sometimes referred to as citogenesis: https://en.wikipedia.org/wiki/Circular_reporting#Circular_re...

There is a list of known incidents: https://en.wikipedia.org/wiki/Wikipedia:List_of_citogenesis_...

But in case they do you can ask your other well established sleeper account for a book reference then reply a few days later with a: This is what I found posting. Then when asked you can point to yourself and say I've asked him. Do a conversation with yourself weighting how a book is hard to validate vs how important the information is to the article.