[jonny_eh]

> I thought this has been known for awhile

What, in particular, are you referring to?

[Afforess]

Leif Erikson? Popularized by Spongebob, no less.

[cguess]

This is about nailing the exact date that this settlement was built. Leif Erikson was almost certainly earlier anyways.

[z3c0]

According to Wikipedia, he died in 1020.

So technically, you're correct. Which is the best kind of correct.