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This seems like a rather extraordinary claim given that linguists have not even come to a consensus about American languages other than that there are dozens of language families.

Seems odd to publish an extraordinary linguistic claim in the "Journal of Biological Anthropology." Is that a normal place for linguists to publish papers?

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I mean native americans arrived from siberia... it's more a linguistic confirmation of a well know fact. why would it be extraordinary?

(for example: https://www.science.org/content/article/closest-known-ancest... )

The extraordinary part is not that they arrived from Siberia, but the claim that two distinct migration waves (well, really four, but the other two are accepted language families) can be distinguished in the linguistic data.

The Bering land bridge lasted for thousands of years, why wouldn't there have been multiple waves of migration?

It's specifically the claim that we can say enough about linguistics to use it as evidence for multiple waves of migration.

(We have evidence for multiple waves from other sources, chiefly haplogroups.)

Note, this is disputed by some of the Diné: https://www.youtube.com/watch?v=MXpJd-V2n4U

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