A turnabout from all the Nazis and other fascists who fled to Argentina, Brazil and other South American countries after the War. He had dual citizenship; wonder if his parents were Nazis?
This story was actually broken by Bild, the German equivalent of scandal sheet tabloids such as the Daily Mail. (I actually read the Bild story, something I thought I'd never do!)
There is a longer article in Pagina 12, a progressive daily similar to Mexico's La Jornada: