But the fact is that the word 'she' is being used to refer to adult human males, with male genitals, and this is widely recognised and understood by the public.
That the public understands and recognises that some people incorrectly use she to refer to males to reflect their personal beliefs does not negate the authors claim that the meanings of these indexicals remains fixed for the vast majority of people.
What you are claiming, suggestionsplease1 is that the small number of people who manifest their belief in the doctrine of gender identity by incorrectly using third person pronouns have the power to change those fixed meanings for every person of the planet, regardless of the restraints of logic, conceptual consistency and interrelatedness that language is subject to and despite the fact that they don't share that belief.
Yours is a bold claim, you're entitled to make it of course. Just as I can reject it, pointing particularly to the fact that the cognitive load imposed on people forced to use pronouns incorrectly is proof (if we needed any) that this isn't natural language change.
It's not the evolution of language, it's not an organic change, it's an abuse of language. It's language as an instrument of totalitarianism.
Oh now don't get me wrong, given enough time such language abuse can indeed change language. I lived through it. You'd be surprised how different the language of East Germans remains to this day, much as I am always surprised to learn that words that I grew up with hold no meaning whatsoever to West Germans. 40 years of imposing those words on the people allows you to indoctrinate at least two generations of children. That's long enough to for it to work.
What neither East nor West Germans call it today though is evolution of language, organic or natural. And neither is this.