the crew has an assortment of mythical characters now known to be based on heroes from other older characters.
the greeks were famous for stealing anything from any other culture that they liked the look of, maybe stealing is a strong word. When Antiochus 1st heard about Oannes from a book he ordered the Babylonian priest Berossus to write he adopted him as a god and Oannes ended up being worshipped back in Greece as a brother of Poseidon. The greeks didn't know of course that Oannes had been invented by Berossus and was based on the Babylonian fisherman Uan. So the greeks got a fishman and Berossus got a good laugh.
When you consider things like that which are known its not hard to see that these stories which by the greek standard were brand new were simply retellings of older stories from older cultures just adapted for a new audience. the claim that the Argonauts went to Colchis at the end of the world does date from their era as its hows that their knowledge of the world went as far as Georgia (ussr). your link seems to be claiming that Colchis was in S America
as such I am not surprised that it didnt get any further as it is on the whole pseudohistoric.
en.wikipedia.org...
Now mostly the western part of Georgia, it was in Greek mythology the home of Aeëtes and Medea and the destination of the Argonauts, as well as being the possible homeland of the Amazons. The ancient area is represented roughly by the present day Georgian provinces of Mingrelia, Imereti, Guria, Ajaria, Svaneti, Racha, Abkhazia and the modern Turkey’s Rize Province and parts of Trabzon and Artvin provinces.[7] One of the most important elements in the modern Georgian nation, the Colchians were probably established in the Caucasus by the Middle Bronze Age.[8]



