The speaker questioned the theory that stands the coins founded in North America was someone put it in that place and wants to mislead the public by providing evidences which are contradictory to the reading. The lecture believes that the coins are real and they are not a kind of misleading. 
First, the reading said that the distance between the Norse Settlements and North America is too far. The lecture oppose this theory because the native Canadians and Americans like to obtain objects during their migrating. So they may found the coins half way from their site and bring the coins back to their camp.
Second, the lecture said that there's not other coins found in North America. The professor disagree this statement because the Norse didn't have a permanent settlement, and they will pack up all their things and bring things back to Europe. So it's reasonable that there's no other coins in North America.
Third, the lecture states that the native Americans and Canadians didn't use the European coins as money. That's a truth throughout the research, but the native Americans and Canadians could use the coins in different ways such as using them to make necklaces or jewry, so the Europeans could trade with the native Americans and Canadians to get the resources they need.