So ... what they're really saying ... is that rising sea levels are a long-term phenomenon, and not necessarily tied to any human activity? Interesting.
(They say this a lot, actually. It's not new or especially interesting. But saying this, while also bitching and moaning about Global Warming shows a bit of cognitive dissonance.)
They’re also saying that the folks we know as Native Americans, may not be as Native as some would have us think.
"Cognitive dissonance" is a mild way of putting it. The AGW'ers are telling a gigantic lie based either on ignorance or political chicanery. Very few so-called "scientists" pushing the AGW scenario are actually involved in academic disciplines related to climate, atmospheric studies, historical geology, solar astronomy, etc. The institution of science itself is under attack.
Those old guys had CO2 factories in their caves and they caused the sea level to rise. Their SUVs all rusted away and we don’t find them.