No, those articles didn't discuss grammar, and didn't argue that it was grammatically incorrect to use "female" as a noun - nor did they even object to it, when limited to its usage for female animals.

But it's a bit sad for you to focus on that, while completely ignoring the much more important points made by that list of citations, which I'll sum up for you:

1) The usage of "female" as a noun referring to women is definitely an issue for a good amount of people, particularly but not only in feminist circles, so if you are familiar and sympathizing with feminism as you claimed to be, you'd do well to heed that.

2) This is not in any sense a new reinterpretation of the word. Go read the fascinating Boston Globe article included among those links; the point was made as early as 1856, and in 1900 the editor of the OED commented that using "female" as synonym of "woman" (as a noun) was at that time avoided by writers, except when used contemptuously.

3) In fact, the very reason why there are sometimes arguments nowadays about whether to say e.g. "woman senator" or "female senator", is that people who learned that "female" as a noun is derogatory, somehow forget that it's perfectly acceptable as an adjective in "female senator".

4) And so, rather naturally, writing and style guides advise people not to use "female" as a noun referring to women.

And 5), my turn to add a paragraph to avoid internet tears: you can't be blamed for using the word when you're not aware of the negative connotation, of course. When you are and you do keep using it to prove a point, well, then that's your choice.