So Old Norse had complex agglutinative syntax? Old Norse conjugated verbs with pronominal prefixes that changed according to the direct object?
Granted, I never studied Old Norse. But I'm writing in a Germanic language right now, so I think I have a pretty good idea of the basic grammatical underpinnings of Germanic.
And I can tell you as someone who has studied Algonquian languages (including, especially Delaware/Lenape), there is no reason at all to believe these languages are in any way the same. They just aren't even close. You can't just take a couple words that look that same in two languages and say they are related.
By the way, the latest research on the Walam Olum is that it is indeed a fake, as was suspected when the notoriously shady Rafinesque first came out with it. David Oestreicher, I believe, has done the work on this.
Old Norse is actually very close to Anglo-Saxon in its vocabulary and grammar.