Most of the evidence for terminal Pleistocene coastal occupation is gone.

The Arlington Springs bones are among the survivors.

The Kelp Highway model is supported by multiple lines of evidence beyond Arlington Springs: the early radiocarbon dates from Channel Islands sites, the early dates from coastal California, and the presence of humans at Monte Verde in southern Chile — which requires that people had reached the tip of South America before the Clovis horizon, arguing for an earlier, and plausibly coastal, migration.

But the model remains a model — a well-supported hypothesis rather than a settled account.