A simple trip to Wikipedia would show that he knows nothing. It's really bad when Wikipedia knows more about your field than you do. There have been several studies proving that the map is a forgery.
The problem is that most people don't understand the scientific method. With the scientific method, you take a hypothesis (that the map is authentic) and then you try to find evidence disproving it. Once you have found evidence disproving the hypothesis, it doesn't matter how good a forgery it is, it's still a forgery.
For real scientific analysis:
http://vinland-map.brandeis.edu/explore/material/clark.php
http://vinland-map.brandeis.edu/explore/material/mccrone.php
http://vinland-map.brandeis.edu/explore/material/cahill.php
Sure, there are things that point to it being authentic, but it isn't. If you're accused of murder, you had a grudge against the guy, people heard you say you'd kill him, and you bought a gun that day, that's all evidence that you might have killed him. But if a group of people all saw you at the time of the murder, then you didn't kill him no matter how compelling that other evidence is - in science, a single disproving fact invalidates supporting evidence because that's what truth is.