Although I see what you're saying, I feel that you come a little too close to the suggestion that a fantasy work can never be critiqued by modern standards, which is not a statement I can agree with. I absolutely think that it can be appropriate to take a modern sensibility, like feminism, and apply it to a story that's set in a non-modern time and place, especially one written by a modern author for modern readers. As I said in a comment on the LJ side, I do think there is the opportunity to make good feminist critiques of ASoIaF. I just don't think this is one.