From the wiki I linked > Generally, speakers of the three largest Scandinavian languages can read each other's languages without great difficulty. The primar

From the wiki I linked > Generally, speakers of the three largest Scandinavian languages can read each other's languages without great difficulty. The primary obstacles to mutual comprehension are differences in pronunciation. > In general, Danish and Norwegian speakers will be able to understand the other's language ***after only a little instruction or exposure*** Emphasis my own. The wiki goes on to discuss large variations and regional issues that can make understanding even harder. The claim is not that they understand one another in a zero-shot setting, but they do need exposure and training. They are different languages. Mutually intelligible is a spectrum, not a binary thing (as would be requisite from the original comment).