There has been a successful global conspiracy to keep nuclear secrets secret for the last 80 years (not to mention the official narrative of the Manhattan project is itself a successful conspiracy). Whether the āsecretā was a real bomb or fake one, the secret has been so well-kept that the only bombs used as weapons were the first two. So I do think your āa global conspiracy isnāt possibleā argument fails, but I am interested in all the other details