While this is important to look at, rather than accepting that women could be warriors, it seems that some want to add in the "many genders"

From The article: "What most surprised you in the course of researching your book? One of the controversies right now in Viking studies is should we really be talking about men and women at all? Maybe there were all kinds of different genders. We don’t know if there were more than two genders in the Viking age. Maybe it was a spectrum.

If you look at this one group of sagas called the Sagas of Ancient Times that are often overlooked because they have all these fabulous creatures in them, like dragons and warrior women. It’s really interesting [because] these girls grow up wanting to be warriors. They’re constantly disobeying and trying to run off and join Viking bands. But when they do run off and join the Viking band, or, in another case, become the king of a town, they insist on being called by a male name and use male pronouns.

So it was very shocking to me to go back and read it in the original and say, “Wow, all this richness was lost in the translation.”

I have a few challenges to that. We don't have any historical writing, laws, literature or sagas that refer to a "spectrum". There are men and women. There are usually roles associated with the sexes. When a person or group steps out of their usual cultural roles, it is usually noted. In most languages & references the default for warrior is men. That is why they aren't referred to as "male warriors". But ancient chroniclers, myths & even people today refer to women warriors as "women warriors" or Amazons (specific to females) & not just "warriors".

Secondly, "It’s really interesting [because] these girls grow up wanting to be warriors. They’re constantly disobeying and trying to run off and join Viking bands. But when they do run off and join the Viking band, or, in another case, become the king of a town, they insist on being called by a male name and use male pronouns." By the fact that that the girls are disobeying in order to join Viking bands, it was probably something that was not considered appropriate for females. And as in most cultures where warriors have huge prestige & influence, an underlying attitude would probably be that women weren't strong enough & since strength is superiority, they would be assumed to be inferior. These girls may have been trying to prove that they weren't weak females, that they were as good as the boys. And also, since the default & titles were male based, for another example, as pharaoh was in Egypt, along with the depiction of the pharaonic beard & the term that would apply to a female-that is Queen, was more associated with the male rulers consort, perhaps these girls, like female Pharaohs, wanted people to think of them as the warrior ruler or king rather than associated with a consort or as not being quite as good as a king.

It is similar to what Elizabeth 1 said & why-it was to reassure her people that they were as well protected by her as by a king. That she had the bravery & guts of a warrior king even if her body didn't match a male's strength. "I know I have the body of a weak and feeble woman; but I have the heart and stomach of a king, and of a king of England too, and think foul scorn that Parma or Spain, or any prince of Europe, should dare to invade the borders of my realm: to which rather than any dishonour shall grow by me, I myself will take up arms, I myself will be your general, judge, and rewarder of every one of your virtues in the field."

A Forbes article also brings in the gender identity angle: "Hedenstierna-Jonson and colleagues’ discovery paves the way for a better understanding of the Vikings. While their paper does not specifically raise the issue of how this biological female would have presented to the rest of the group, or how the group would have perceived this biological female, they do conclude that “questions of biological sex, gender, and social roles are complex — and were so also in the Viking Age.”"

Why wouldn't they have perceived her as a "woman warrior"? Unusual in their culture, perhaps a bit "not like other girls", an exception that they permitted?

Instead of gender identity being the reason someone might take on male titles, or in the example of the Sagas of the Ancient Times-use male titles & names-perhaps it is because the culture chose to grant some individuals an exception & just kept the status quo terms & allowed them to use it, instead of trying to stretch their cultural beliefs to accept a Queen as being as powerful as a King, or that a Woman might be gender nonconforming & able or interested in performing some other roles. Not typical, but still a woman.