“There are those (who obviously have their own ethnic axes to grind) who claim “they” have always been here, that their ancestors were made in the Americas, and didn’t come from anywhere else.”
If they have a creation story then they obviously know they have not “always been there”. A more fair context would be “As long as we can remember we have always been here”. And if you have been in the same place for 13,000 years and do not actually remember how you got there “We have always been here” is a fair claim since they have no knowledge of any other reality. It would even be fair for the Norse to claim “We have always been here” based on what they remember. They have lost how they actually got there. So to the “best of their knowledge” it would be a fair claim to say “We have always been here”.
In reality in between the lines the big argument and controversy is “Did we displace anyone who was here before us.” The first Norse to the north did not, the first to Australia did not, the first to Japan did not, and the first to the Americas did not. These absolutely have a right to claim to be first without displacing someone because they were.
The point is, they haven't even lived in the same place in the Americas for a particularly long time. The most valuable tales of the oral tradition (which is, for the most part, all they've got) are the ones describing how they came into an area whuppin' ass of whomever preceded them.