Don't worry this isn't another what if such and such happened with Gotti and Castellano that has been covered a hundred times over.

Reading Gotti: The Rise and Fall and it turns out the Feds gave Armone a deal that if he said "I formally denounce my membership of the Gambino crime family and any office I may hold within it".

Most likely a joke by the Federal government but then again if he said it he'd look weak.