JP2 said a mix of good things and very problematic things. Even good things like more easily available Indult Masses were more about flanking the SSPX. It would have strengthened the Cardinals' case if they quoted something, anything, before V2. I cannot see the dubia as something wholly fake, but there could well be an element of diversion, drawing Traditional Catholics into rivalries between Conciliar bishops. Using JP2 helps strengthen the Council as it makes JP2 a paragon of orthodoxy. He might have been a paragon compared with Pope Francis, but he was no paragon of orthodoxy and the Catholic liturgy, even if he was the last Pope who was a bishop before the Deluge.