While I'm not so sure about what exact means by 'Norse culture' in the video in question, it is true that more and more scholars are hesitant to see the popular image of Old Norse mythology and culture, mainly based on medieval (Christianized) Icelandic manuscripts, either as a proper representation or as a reasonably accurate re-interpretation of the past of whole Viking Age Scandinavia. In other words, one can say that the extant information in medieval Icelandic parchments is only an 'unofficial/ not so proper representation' tip of the very large iceberg of '(Old) Norse culture' that we have little access to any more, and is very difficult to reconstruct solely based on a small piece of the extant evidence.

Whereas I'm also willing to offer a reply to some follow-up or to clarify the problem further, I also hope that the following excellent answers on the problem lingering on the alleged 'Old Norse religion' in this subreddit might give you some idea on what I discuss above:

• How much do we actually know about the ancient religious traditions, deities and narratives of the Norse? by /u/Platypuskeeper
• Viking-era Norsemen: Did they consider entities like Fenrir, Surtr and the Jotnar to be villains and enemies of mankind like Christians do with Satan? by /u/Steelcan909
• (Added): I also wrote for a while ago on the complexity and plurality of beliefs during the Viking Age in Getting into Valhalla- representations of Dane religion in the show “The Last Kingdom”