There were people in the Americas long, long before the last ice age. That is pretty well accepted now.
Chinese, Norse, Siberian....who cares? Its an interesting conversation, but it changes NOTHING.
No one cares.
“No one cares”
Not true. The CCP cares.
It does not matter who “discovered” the Americas first.
No matter if they had not sailed, the New World would still have been found by Pedro Álvares Cabral in 1500 on his trip to India.