I won't say that the notion of heg women is a completely unhelpful notion, on the contrary I think the tendency for women (including feminists) to become complicit in patriarchy is really important and deserves more focus than it typically receives, but I don't think that this concept should be cut along gendered or racial lines.
While it's true that trans and nonwhite women, and especially trans nonwhite women, are less likely (and able) to participate in this behaviour, this is a difference of extent, not of kind. While these women are less likely to participate in patriarchy in the wholesale manner (of say, Caitlin Jenner or Blair White) which is seen as more typical of this kind of opportunism, degrees of opportunism are still very widespread. On this very blog I have seen both white and Black women, cis and trans, support the transmisandry theory nonsense, even as they are otherwise leftists and even feminists. This kind of piecemeal approach to supporting patriarchy is more common than it might appear though, as often it comes in the way of intersectional systems of privilege, as the cis woman terf reveals.
White trans women in particular will still appeal to the white state's protection of white women, we will still seek the safety provided to us as settlers in settler countries, and we will still take advantage of the privileges afforded to us not just as white people, but as white women specifically. I won't speak to inter-community Black issues I have little knowledge of, but I know that colorism and colonialism are still prevalent problems there too, and suggest that this piecemeal nature simply changes in scope and severity the farther one is positioned from the white cis masculine ideal.
There is no line in the sand where patriarchy decides that you get to be the type of person that it seeks to "protect", because that line is a myth. In the words of Emma Heaney,
But, then, who is outside of sexual difference? The answer is none of us. Cis or trans; men, women, nonbinary people: all of our sex and gender experience is devilishly bound by its symbolic field... The experience of sexed embodiment is also (and relatedly) a reminder of our “unending penetrability.” We are simply differentially positioned regarding this universal penetrability of bodies, which is the material reality of sex. All of us live in bodies that are interpreted in the terms set by this ideological formation, more or less able to deny or deflect our body’s penetrability. (Feminism Against Cisness*, 27)
Patriarchy, to the extent that such a social force can even have beliefs, does not believe in cisness or in race or in protecting anyone. In a room of nine trans women and one cis woman, the cis woman is (or can become) a heg woman. In a room of nine men and the same cis woman, she is not.
The takeaway here is that "heg woman" should not refer to someone who has the capability (resulting from her racial, gendered, or some other nature) to participate in patriarchy, because that woman is everybody. Instead, heg woman is a thing you can become, it is an occupation, a temporary social position, not a class. It's just that, like many actual occupations, it's hiring process favours the most privileged of us.
You can become, without realizing it, a heg woman. You being a woman, you being queer, you being trans, even you being nonwhite, none of it is inherently disqualifying. It is your responsibility as a woman and as a feminist to prevent that from happening.
