What about his Jewish victims? Did they go from Auschwitz to an eternity of damnation?
God is both perfectly just and perfectly loving, and both those factors need to be kept in mind or a person will quickly develop a badly skewed perspective on Him. The Gospel is free and it reflects His perfect love for us; likewise His perfect justice means He cannot be a sloppy accountant regarding sin.
It’s between each man and God where he will spend eternity. Only God, and God alone, makes that judgement.