I've heard this story before.
The Barossa Valley area in South Australia (which is world famous for it's wine growing) isn't all that heavily populated, being about 15,000 people in all. There are many German families there.
The Angel of Death spent the last years of his life supposedly in Brazil and when he died on February 7, 1979 was buried in a grave marked 'Wolfgang Gerhard' whose identity he had assumed. The body was exhumed in June of 1985 for forensic identification but I'm not aware of the results.
He supposedly suffered from osteomyelitis from a young age.
I think he'd have to go down in history as one of the most vile and disgusting humans that ever lived. A really sick and twisted man.