We actually do have material evidence connecting pre-age of discovery Siberia with Alaska via Aleutian trade and shared genetics, though, and the strength of th

We actually do have material evidence connecting pre-age of discovery Siberia with Alaska via Aleutian trade and shared genetics, though, and the strength of the product of evidence is always stronger than a single hypothesis of connection in isolation. To my knowledge no such archeological or genetic link has been established between pre-Vinland saga Greenland and Iceland, let alone Norway. (Hell, I'm not sure there's any genetic evidence of admixture between the expeditions of Erik the Red and Greenlanders despite clear cultural and material evidence of contact, though that's probably more of a testament to lack of continual trade than evidence it didn't occur at all.)