It's documented in UFO lore, and is referenced in the Ross video, and may be better referenced in his book book 'In Plain Sight: An Investigation into UFOS and Impossible Science.' I say may be because I have not read the book, yet, but given his long history of reporting, if he mentioned it in the video, then he likely referenced his source, or stated he can't reveal his source. He isn't the only one to reference this. Bob Lazar has also referenced this in several videos.