“No, it’s Catholics who believe that you can be prayed out of Purgatory if you’ve ever accepted the Catholic church’s teachings.”
It’s Holy Week leading up to Easter and I’m not going to get into an endless and futile debate regarding Catholicism vs. Protestantism, but please know that your above statement is patently incorrect. One can pray for people who have already died, for their very souls, but only God can judge and bring a person into heaven.
However, if you do believe it's up to God, but still based upon, in part, prayers of the living on behalf of those who are dead, then the prayers of Catholics should indeed be able to help persuade God to let Hitler into Heaven, even if he dies in apostasy. This is something Protestants do not believe.