I have no opinion on whether Satanic acts may have been done by some renegades in the Vatican. Regardless of whether any such things happened, it does not mean that Satan has won or that Satan has prevailed.
Satan is a clever and powerful adversary and it would not be beyond him to put his agents into positions of power within the Church. Just because the US is the most powerful country on earth does not mean there are no spies in high government positions.
The Church has gone through tough times before and it has always prevailed. As long as Christ is with us, Satan will always lose. There was a time when there were 2 or 3 popes at the same time, some popes were puppets of rich or powerful leaders, but in spite of all that, the Church has still prevailed. Christ’s Church has survived poor or corrupt leadership, it will continue to survive even some alleged nutcases in its hierarchy.