[AlotOfReading]

I'm a (formerly working) archeologist. Native American land claims are horrifically complicated and way beyond my knowledge, but I'm not aware of anything that's legally based on the scientific consensus about the earliest inhabitants of a specific area. Instead, the term you'll commonly find used is "aboriginal title", which basically just means "we've been here a long time". It's as deliberately vague as it seems and isn't affected by pre-Clovis at all.

NAGPRA has run into complex issues with ownership being unclear when we've found ancient remains, but that doesn't mean people are rejecting the concept of pre-Clovis. It's a separate set of issues entirely.

I'll mention that many indigenous belief systems do incorporate aspects of "we've always lived here" when that's clearly not what the archaeology says. Most such people accept both sides as belonging to separate things in my experience. It's not all that different from Christians who believe Exodus happened for example. The scientific consensus isn't really relevant to that belief and that's fine.