The Vatican and OSS were working together to move Nazis from Germany to Italy and thence to South American countries. This has been written about many times in books and news reports. I am surprised anyone could have missed it.
The allegations about the OSS are particularly lame. They are based on the OSS's later use of remaining Abwehr assets behind the Iron Curtain. There were no Nazis smuggled into South America for this purpose. For details, see Otto Skorzeny's "My Commando Operations".