@marshray You're missing the point. The point is not so much "women were warriors" it is "our reductive telling of history* is heavily tilted to disregard most of what is important, and so our idea of what 'samurai' means, is just plain wrong."
We're so used to "hero stories" and main characters that we're oblivious to this.
*) let's be honest, this is true for the stories we tell today.