So, instead of the intention for Vatican I to define the Church's and Christ's temporal authority ... they brought us the exact opposite in Vatican II with "Religous Liberty", separate of Church and state, and the dethronement of Christ the King.
In fact, with the election of Pius IX, they thought they had their man, but after the revolutions they started a couple years after his election, he was "converted" from having been widely regarded as the most liberal Cardinal in the Church to their intransigient enemy, and that's a large part of why he convened Vatican I, to put a stop to those forces.
BTW, that's one reason I believe Prevost is not a pope. I believe that due to the Promises of Christ for the papacy, that God would convert anyone who was simply a guy whose mind was messed up and where he erred in good faith ... just like he did with Pius IX. I find the evidence that Pius IX had been a Mason to actually be fairly credible, but even if he hadn't formally joined, he was widely thought of as having been extremely sympathetic to the most liberal political forces pushing through Europe. In any case, they thought they had their guy on the See of Peter, but when that failed due to the Promises of Christ over the papacy, that's when I believe they hatched the idea for the Siri operation.
If you recall in the Alta Vendita likely written in the 1830s or 1840s, it says they were waiting for a Pope who had their mindset, in terms of being a liberal. In 1846, they thougt they had their guy in Pius IX. So they were emboldened to set off those 1848 Masonic revolutions ... but then Pius IX was converted (at least from his liberalism), and became their strongest enemy. He convened Vatican I precisely to combat the errors of these Masons, starting with defining the Popes spiritual authority, and was going to define Christ the King and the Pope's (and Church's) temporal/secular authority as well, which would have completely pre-empted their plans for Religious Liberty. So in 1870 they needed to interrupt and suspend Vatican I before it completed its job ... and they pulled it off. And instead of getting Vatican I part 2, they give us Vatican II, which does the exact opposite.
In the meantime, they started up WWI, and then set up Communism, to continue preventing this, and then leveraged Communism to infiltrate the Church, the hierarchy, and ultimately pull of the Siri Theory, where Commie agents among the Cardinals took care of business.
They had realized that a real / legitimate Catholic pope would be prevented by the Promises of Christ from wrecking the Church, so they devised a way to stick an illegitimate (uncanonical per St. Francis prophecy) into the See who would not be protected.