Everyone agrees Native Americans / First Nations / Indigenous population have been in the Americas for over ten thousand years. The Vikings went there about -- or, according to this discovery, exactly -- a thousand years ago.
Absolutely nobody thinks proving the Viking journeys can in any way deligitimize the native's claim to primacy. Well, absolutely nobody who isn't totally befuddled.
Even with visiting in 1000 AD, the "indians" have 10-20,000 year lead.
https://en.wikipedia.org/wiki/Kennewick_Man#Race_factor
'The New York Times reported "White supremacist groups are among those who used Kennewick Man to claim that Caucasians came to America well before Native Americans." Additionally, Asatru Folk Assembly, a racialist neopagan organization, sued to have the bones genetically tested before it was adjudicated that Kennewick Man was an ancestor of present-day Native Americans.'
Also the whole "Solutrean hypothesis", also disproven/discredited, but living on among the conspirational and often racist.
However, I don't think interest in the Viking archeology from the last 2,000 years can be written off in the same vein.