The difference is important.

Scrutiny means applying rigorous methods to evaluate the evidence and identifying specifically what additional evidence or methodological improvement would be needed to either confirm or refute the claim.

Dismissal means simply declining to accept the claim without engaging with the specific evidence.

The long marginalization of Bluefish Caves in the pre-Clovis debate was, at least in part, an instance of dismissal rather than scrutiny.

The third lesson is that the development of scientific understanding is often slower than the development of evidence.