The mere existence of trans people doesn't threaten women's rights but the demands made by transactivists in the name of their identity have repeatedly done so. The worst effects are seen where gender identity has been most indulged at the expense of sex. For instance: in Australia, lesbians cannot now gather or date in women-only groups; any male who says he is a lesbian must be included. In Germany, a far right criminal is currently trying to identify himself into a women's prison. He may well succeed.
It's not only women's rights. In the UK alone, damage has been done to academic freedom, the principle of civil service impartiality and the coherence and integrity of public data. That's before we begin on the risks of a fashionable "solution" pushed at children and young people who are uncomfortable - for any reason - with who they are.
The concerns expressed on this board about women's rights and the threats posed by privileging gender ideology above reason are not a "guise". They are real and justified.