How did they get there so quick though?
Even with Red Cross passage - papers all neatly prepared thanks to the Vatican - I'm convinced it was via submarine.
In which case Nazi sympathising Peronists with the aid of the US must have been involved, as by then the Atlantic was pretty much completely dominated by Allied naval forces.
No VIIC submarine fleets could have realistically travelled non-stop, undetected, from the normal Nazi bases - Kristiansand, St Nazaire, or even alleged secret sites in Spain and Portugal, without either being given safe passage, or being blown up.
Wow, I'm a conspiranoid!