I find myself often winging it with “themself/themselves” and it seems to be like themselves is always colloquially correct when there are multiple preceding nouns you’re referring to…
Otherwise if there’s only one antecedent or whatever, its themself
Be gentle haha
Might have been an idea to factoid-check that claim in a dictionary before posting because it’s not really correct.
Factoids are to facts what humanoids are to humans. It does not mean the “exact opposite” at all.
The second definition in your quote confirms that factoid can mean a widely-accepted false fact.
It’s the original meaning of the word, coined by Norman Mailer in 1973.