Are you saying Pope Pius XII was a fake pope - an antipope?
No. John XXIII, Paul VI, John Paul, John Paul II, Benedict XVI and Francis are all pseudo-popes. I wouldn't even call them antipopes because the antipopes of the past professed Catholic doctrine. But the Novus Ordo sect has pseudo-popes just like the Anglican sect has a pseudo-archbishop of Canterbury. Fake pope would be another term for the same idea.
Pope Pius XII was a true Catholic pope.