[Lazare]

It means nothing.

Archeological evidence found in the 1960s proves quite clearly that Norsemen reached the Americas 500 years before Columbus. In fact this evidence turned up - and got quite a lot of attention - in the 1960s, which is when this map was first published. But by the 1970s, analysis of the ink made it fairly clear it was a forgery.

This news is just that a more detailed analysis has been done, proving the map long believed to be a forgery was definitely a forgery. But the map was never really considered evidence of anything in particular; it was always questionable.