Yes, multiple waves is suggested near the very end of the article, and that this is a focus of current data collection:
> Another possibility ties together evidence of Population Y and potential archaeological evidence at sites like White Sands. Could there have been multiple migrations into the Americas, with one pre-LGM migration consisting of Population Y individuals (and perhaps Unsampled Population A or other groups we have yet to identify), and one post-LGM migration? This would reconcile the archaeological evidence of early traces of humans in the Americas (if they are indeed legitimate, which has yet to be demonstrated to everyone’s satisfaction) and the genetic data.
> Archaeologists sceptical of White Sands’ early dates are dubious of the second scenario, and it is admittedly speculative. We need a great deal more data, both genomic and archaeological, to test it. But, as a field, we are actively engaged in collecting that data, even as I type these words.
> Another possibility ties together evidence of Population Y and potential archaeological evidence at sites like White Sands. Could there have been multiple migrations into the Americas, with one pre-LGM migration consisting of Population Y individuals (and perhaps Unsampled Population A or other groups we have yet to identify), and one post-LGM migration? This would reconcile the archaeological evidence of early traces of humans in the Americas (if they are indeed legitimate, which has yet to be demonstrated to everyone’s satisfaction) and the genetic data.
> Archaeologists sceptical of White Sands’ early dates are dubious of the second scenario, and it is admittedly speculative. We need a great deal more data, both genomic and archaeological, to test it. But, as a field, we are actively engaged in collecting that data, even as I type these words.