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Hmm… the only cited sources in that article for a specific (effective) population size are also over 20 years old—the more recent sources just say it was likely a “small” number.
This article has a lot more detail on the various migration theories, but refrains from any specific size estimates:
https://en.wikipedia.org/wiki/Peopling_of_the_Americas
When research is old without being found wrong, it is more likely to be correct.
Lots of truth to that but not a lot of grant money available for replication research. After initial peer review might not get revisited for a long time.