Or the Bering Straight. Or the south sea islands. Or any number of other theories. The Norse also beat the Inuit to Greenland by more than 200 years and that is recorded history. Does that make the Inuit in Greenland interlopers too?
The ancestors of the current American Indian tribes were not interlopers. They just were here in the Americas first, and long before the Europeans came to the New World.
Someone actually once took DNA samples of the members of various tribes across America, and genetic matches were found with the present day inhabitants of the various “stans”.....those areas that, prior to 1991, were known as Soviet Central Asia.
I wish I remembered where I read that story....it was a number of years ago.