Some of his claims are quite far-fetched and esoteric. However, even Michael Shermer, head of Skeptic magazine, recently admitted (https://twitter.com/michaelsh

Some of his claims are quite far-fetched and esoteric. However, even Michael Shermer, head of Skeptic magazine, recently admitted (https://twitter.com/michaelshermer/status/1237559469967421440 https://twitter.com/michaelshermer/status/123755946996742144...) that there is some plausibility for the younger dryas impact hypothesis, which is currently an important part of Hancock's lost civilization claims. Such a major catastrophe would of course have a reset effect on any existing advanced civilization. This alone is not proof that there was one, of course.