Doubtful Mengele escaped final judgement even though he escaped earthly judgement.
I hope he didn’t. Remember, that one of the tenets of Nazism was that religion was a fairy tales (as liberal Americans say today) and that the socialist collective Germany was more important than any afterlife. That’s what allows you to condone committing atrocities, because life doesn’t matter, ultimately, and the only thing that will be here forever is the collective or “Reich” in his case. I fervently hope he is still discovering how wrong he was this very day.