I did read the article. There’s nothing in there that distinguishes the Viking stuff from the neo-lithic age boat.
There are problems when archaeological dating overlooks stratiography in favor of isotope decay rates which can be effected by volcanism and other factors. If items are found buried together, chances are they were contemporary. Prof. Gunnar Heinsohn has done work on this issue: http://en.wikipedia.org/wiki/Gunnar_Heinsohn in which his stratiography moves European history closer to us by 700 years and makes Charlemagne into a Roman General. His work is controversial but needs to be looked at. There is also some fascinating work by Prof. Felice Vinci who interprets the event of Homer’s epics as occurring in Scandinavia, that the Trojans were Finns and the Greeks were Swedes who later migrated to the Aegean as the enigmatic “Peoples of the Sea” recorded in Egyptian records. See his well documented and rigorous “The Baltic Origins of Homer’s Epic Tales”. Most of this dating controversy stems from Immanuel Velikovsky’s “Ages in Chaos”.