From Dr. Eric Davis, Astrophysicist & Chief Intelligence Officer Regarding the TR-3B Myth
If anyone would know about the existence of the TR-3B, it would be Dr. Eric Davis. In a post on Luis Elizondo's FB group, here is how he explained it in reply to my question:
... "I know Eric Weinstein and he’s terribly inexperienced and uninformed compared to my 30 years in UFO investigations and research. The term "TR-3B" did not exist in UFO folklore until Edgar Fouché introduced it during a presentation at the 1998 International UFO Congress (IUFOC). Fouché, who claimed to be a retired U.S. Air Force avionics master sergeant, claimed the U.S. military had secretly built a tactical reconnaissance aircraft using reverse-engineered alien technology. Fouché invented specific, highly technical-sounding pseudo-science to describe the craft's hoaxed propulsion system. My collaborator from LANL, Bill McGarity, tracked down Fouché and interviewed him at his home. Fouché admitted to McGarity that he made up the entire story because he wanted the high profile notoriety associated with being an alleged military insider with knowledge of classified UFO information. He was no disinformation agent for the USAF or the CIA. He was just a BS artist".
EDIT: What people were actually seeing was an authentic UFO in the Black Triangular Craft. The government was most likely using the TR-3B myth to mislead people due o the numerous sightings. It started back in the 90's, and the government has always been engaging in UFO cover-ups.