“Factoid” does not mean “a little fact.” It means something that looks like a fact, but isn’t. Just as an “android” looks like a man, but isn’t.
No one claims that Cruz was not born a citizen. The rigorists claim that the framers and ratifiers of the Constitution meant by “natural born Citizen” only a person born on U.S. soil of two citizen parents.
An asteroid doesn’t even look like an aster.