Cis woman is a perfectly valid term, no matter how trans-excluding feminists want to twist the language in order to use old tactics of being the victimized, marginalized group against a group that they are currently victimizing and marginalizing.
I do in fact use terms for ethnic groups that many members claim they consider grossly offensive; black and African American. Most however, don't. This is the OVERWHELMING case with cis woman as well.
This is a basic fact that every TERF and other trans-excluding 'woman's' group fails to integrate; you do not own womanhood. You do not speak for womanhood. It is not a weapon you can swing against the other. This fear isn't of losing 'what they've worked for', it's for losing control and power. It's the sad hanging on to power that was fought for at first for noble goals, but power does what power does. 'Erase your identity' only works if one believes the markedly unfeminist idea that what is between your legs defines you as a person. What are you afraid of losing? From you last article, it looks like you want to reject women from being given shelter from violence because they're trans women, even though trans women are at greater risk of violence than cis women. How very kind of you.
Be grossly offended. Being offended doesn't make you right. I'll continue to offend you just like I continue to grossly offend radical Christians by denying a belief in any god, just like I'll grossly offend Trump supporters by opposing his harms, just like I'll grossly offend anti-vaxers with scientific facts.