Lombardozzi being a rat is not proven, it is just a gimmick.
Do some research. It is likely he was. It’s not 100% proven but it definitely points that way.
Most fo the hints at it could come from the wire used to record him or a person with him, often the FBI names a wire after the primary subject of the wiretap. The rest comes from internet wannabe detectives trying to see who it could be that gave info. As soon as the rumor starts it takes off.
