I have emailed:
[dear .. etc intro ]
First, free speech isn't about speech I agree with. I don't agree with everything Meghan Murphy says. Equally, I don't think that the act of questioning whether some spaces should be reserved for natal women and/or post-transition trans women, for some definition of transition that is not straight self-ID, is being active "against trans rights".
There are people who self-ID as women for the purpose of accessing women's spaces. There are indeed vulnerable transwomen. There are vulnerable women (trans and otherwise). The decisions we make about sport, prisons, and refuges affect many. Post-op trans women may be vulnerable in different ways than those who identify as a woman only on some days of the week but enjoy male privilege on other days. Are we using self-ID only? Are we doing this for race too -- who can identify as black or indigenous? (We don't use self ID for race, but why not? The biological basis of sex is much stronger than that for race). In other words, race and gender are very different, and gender doesn't equal sex. These topics are important and we should promote open discussion and debate. The activist quoted at length at the end of your article, making the analogy between protecting sex-based rights in some settings and racial segregation, leaves the article on a very slanted note (which I don't think was your intention - I hope not).
I also object to your use of "ciswomen". I am not a "ciswoman". Stonewall - a pro-trans rights leading charity - defines "cis" as "Someone whose gender identity is the same as the sex they were assigned at birth". And what's gender identity? They define it as "Often expressed in terms of masculinity and femininity, gender is largely culturally determined ..". I don't identify with culturally determined ideas of femininity or masculinity. I'm a woman because of my body and my experience, but I don't identify with the cultural definition of 'woman. Women aren't either "cis" or "trans" -- that's another false binary, enforcing rather than questioning gender stereotypes.
I hope that when writing about these issues you may seek to adopt a more inclusive tone that recognizes the subtleties here in the future.