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Yes, I believe that's true.
Padraic Colum's text shows us a different angle of Jason and the Argonauts myth. Almost as if in an attempt to complement the original mythical tale, he gives an extra 'life', an individualization to the characters that brings us closer to them. He brilliantly does so by narrating events that would have occurred between the 5th and 6th paragraphs of the original myth text, when Jason would return to his ship Argo to meet his comrades after he learns (and agrees) to the tasks proposed by King Aietes intended to prevent him from getting the golden fleece, and before he seeks Medea's help in accomplishing those tasks.
He wrote it to argue that the characteristics associated with the American national character were indeed forged on the western frontier.
He also argues that it was the Western frontier and it was not the Eastern frontier. I hope this answer helps you out and that you have a great day!!! <3 :)