“Not all of us are willing to assume that the western hemisphere was settled once from Asia alone.”
I agree with you, totally.
Archeological evidence of ice age arrivals from Europe would likely be erased by rising sea levels. A seafaring or shore dwelling culture wouldn’t immediately flood inland as they arrived. They would stick to what they knew and adapt and expand inland as their numbers grew.
A couple of hundred miles of continental shelf on the east coast was once habitable dry land.