1300 Year-Old Viking Skis

In 2014, archaeologists uncovered a lone wooden ski on Digervarden Mountain in Norway. Fast forward to 2021, researchers discovered the second ski buried more deeply in the ice. Both skis were handmade over 1,300 years ago and were not identical due to their individual history of wear and repair.
I'm wondering, if s/o writes:
"Faaaake - how can it be?
The US exist since 1776-07-04 ! Nothing can be before!
Don't be a woke leftist, do your own research, touch some grass and never trust science or the universities!"
Bomb! What the fuck?