There are plenty of valid claims that many other civilizations contacted America: https://en.wikipedia.org/wiki/Pre-Columbian_trans-oceanic_co... But it is meaningless since they did not write about it nor they stablished commerce. The fact is that before 1492, most civilizations in Africa/Asia/Europe did not know that America existed and that other humans lived there. After 1492, that changed forever.
A monk in 14th-century Italy wrote about the Americas
https://www.economist.com/the-americas/2021/09/25/a-monk-in-14th-century-italy-wrote-about-the-americas
There was an interesting recent Economist story about that. There is a 14th century Italian monk that did write about Newfoundland based on the oral testimony of “sailors who frequent the seas of Denmark and Norway”. It is possible Columbus was aware of this.