???
Not a chance in Hell.
What happens when the Argentine population finds out? How can you expect foreigners to set up a government over another country in secret? Argentina is real place with real people, not some geographic Deux Ex Machina you can use to continue WW2.
In real life, the Nazi criminals that did make it into Argentina, much like in the USA or anywhere else, had to do so in secret, under fake identities, without most of the population finding out. Perón did not want his voters (including Jewish Peronists) to find out he had allowed Nazis to hide in the country. After all, Argentina has the 5th largest Jewish community of the world, and officially Peronism was a big supporter of the State of Israel since its inception.
The German Argentine community also dates from the 19th century, with the largest influx coming in the decade of 1900s, before the Nazis even existed. It also included many liberals and opponents and refugees of the Nazi regime. The largest German daily in the country, Argentinisches Tageblatt, is a centrist newspaper and opposed Hitler's rule throughout the war, it was banned in Nazi Germany. The suggestion that all of them were Nazis or Nazi descendants is frankly quite insulting.