I can't imagine how self-assured you'd have to be to tell someone "You know what? Your daughter never existed." Like reality just conforms to their whims.
The far-right media will denounce this action, conveniently ignoring that it was their demagoguery that set these "truthers" on the path they're on now. They didn't wake up one day and believe this shit, the far-right's been dogwhistling it since day one.