I happen to think that both men should have re-canted publically due to the public nature of their sins.
Check the Sam Donaldson interview. Priebke admitted his crime. He said he was a Nazi until 1945 and was glad it was over. He said he didn’t want to carry out the order and he was sorry for the victims. Current reports state he had been suffering dementia and had been watching cartoons, so I would discount the “last testament”.
I don’t think Priebke converted to Catholicism until he was in Argentina.
Cradle Catholic, Ted Kennedy is a different story.
Thee you go. That’s a good answer.