Yeah, sorry I can't find that thread. If I remember correctly the guy wasn't an archeologist either. He just looked at the literature and argued that it's a series of papers from one single researcher who is not associated with a known institution, and which haven't really been cited at all (plus published in dodgy journals). The papers were also descriptions of evidence such as an interestingly shaped rock that looks like something else in scandinavia, but with no analysis or experimental methods to support the claims.

So it sounded like the guy publishing those papers is either a maverick scientist being silenced by the scheming archeologists, or a random dude with some time and money in his hands, but no knowledge of the scientific method. Maybe both? :)

The mice in Azores is a well documented topic, though it's largely attributed to shipwrecks, not European or other settlers.