Like many things are, this article is True, False, and Irrelevent, all at the same time.
It is True because, yes, you can find many similarities between Norse myths and Christians myths.
It is False because most of the myths we have (at least here in the US) are from the 11th century from that one dude in Iceland -- Snorri Snurlson, if I remember correctly, which I may not. He was a Christian monk. His stories are know to be tinged by his belief but, last time I checked, it wasn't know *how much* of the stories were tinged by his beliefs and how many of them were accurate to actual pre-Christian Norse beliefs. Add that most of the Norse had been Christianized for centuries at that point, and the authenticity of the stories is really in question.
It is Irrelevent because *all* ancient religions, of the Old World, at least, were influenced by each other. Kali, the Indian goddess that wears the skirt made of human heads, and who had the Thuggees as her worshippers, is the SAME mother goddess that the Wiccans worship. One had followers who strangled people and burried them at crossroads; the other has worshippers who eat veggie burgers. But, when you trace them back, they're different aspects of the same goddess.
The author of the article suffers the failing that many specialists have. They know their specialty and can see the connections to other disciplines. What they fail to see is the myriad of other connections that exist, making their tiny snapshot of the facts both quiant and irrelevent.