I think the linking of the phrases "trans women" and "black women" is particularly relevant here.
There are any number of adjectives we could use to describe the noun "women", but you would generally only refer to several different ones together when you are describing characteristics which have some relevance to each other.
So, for example, you would be unlikely to use a sentence which contains both the phrase "short women" and "Australian women", because there is no obvious link between the adjectives "short" and "Australian". But you might use a sentence containing both the phrase "tall women" and "short women", if you are saying "tall women find it easier to reach high shelves than short women" or "short women find it easier to buy well-fitting jeans than tall women" or "tall women find that most makes of car are comfortable for them to drive, whereas short women could benefit more from driving Japanese cars because they are particularly well suited for smaller people".
So when would we use both "black women" and "trans women" in the same sentence?
My guess is that it is almost always going to be when talking about discrimination.
It would be absolutely relevant and appropriate to talk about "black people" and "trans people" in the same sentence when talking about discrimination, saying that both groups are known to be at higher risk of this treatment.
When you talk about black women, as opposed to black people, you are probably referring to the fact that this group is at risk of discrimination for two reasons: being black, and being female.
If you compare "black women" and "disabled women", you are referring to two groups, both female, both at risk of discrimination for being female, which provides a sensible starting point for discussion about the extent to which being, respectively, "black" or "disabled" increases that risk of discrimination still further. This is essentially the primary concern of intersectional feminism.
But by comparing "black women" and "trans women", you are completely muddying the waters because you are comparing a group of people who are at risk of discrimination for being female and for being black, and another group of people who are not female but are separately at risk of discrimination for being trans. You are comparing apples with oranges, and unlikely to gain much useful insight. You are also most likely going to end up excluding "trans men" from your analysis because of the word "men", when "trans men" are actually a much more relevant comparator to "black women" or "disabled women" because they are at risk of discrimination for being female, and also at risk of discrimination for an additional reason, in their case, being trans.
The whole thing is just spectacularly unhelpful, to all kinds of groups.