Became curious and had a look at its amazon reviews: https://www.amazon.com/Children-Ash-Elm-History-Vikings-ebook/dp/B07XCSRG2S
Seems you are not alone - quite a few readers think he comes up with unsubstantiated claims or tries to impress modern cultural sensibilities upon norse culture. Haven't read it yet, so have no opinion myself.
I haven't read the book, but I heard a very good interview with the author of this, and the Vikings/et al. were really fascinating culturally.
I'd recommend reading/listening to the The Almost Nearly Perfect People. The audiobook is great and the narrator nails the tongue in cheek observations about the Nordic countries pretty well. The book tackles each country and has a portion that touches on the closet racism/nationalism in Norway at the very least.
I think they'd certainly be considered better than most because of the lower populations and whatnot but it's still there.