There exist some statements that become untrue simple because someone has said them publicly. A conceptual example might be
I have never said the word: contumacious. A more realistic example might be
0QlmIfMjYFLUrCtBT8qd is a secure password.
These kinds of statements are probably not common, but is there any single word or phrase that can be used to describe them?
Such statements are called self-defeating.
Self-refuting ideas or self-defeating ideas are ideas or statements whose falsehood is a logical consequence of the act or situation of holding them to be true.