You just said some set of facts is 100% true and accurate on the basis that it is rumoured to have occurred in a private conversation of which no one can valida

You just said some set of facts is 100% true and accurate on the basis that it is rumoured to have occurred in a private conversation of which no one can validate. This is problematic. Example: I know for a fact that 9/11 was inside job. I communicate in a private think group, so you can take my word for its truth.