To be fair, there are sometimes even if rarely people who are born as what people typically associate physically with male or female but have voices closer to the opposite. So it's not necessarily something that comes completely out of nowhere just because a transperson is involved. So ya to be clear, it's not necessarily inaccurate if she felt that way for a long time but only felt comfortable coming out much later. You'd have to ask her though I suppose. But aside from that it's probably to erode the idea that females don't sometimes sound like males because of transwomen who either don't or haven't bothered to practice adjusting their voice as much as possible (or don't use a program that makes their voice sound more like what is considered feminine which can actually work very well depending).
I'm also not sure if like male and female are considered anymore inherent to "sex" rather than "gender" which could itself present problems especially if someone has already begun transitioning.
I see what you're saying though, the struggles of transpeople and their identity get caught up in this and at the same time ends up getting rid of a label for vocal tendencies and it's hard to have it both ways and please everyone. Perhaps if a label showing that there is a stereotypical male voice involved it would seem less potentially problematic.
Edited July 9th
by Grey Echelon
Intersectionality can kiss my white cis ass.
In other periods of time I may have been willing to tolerate it, but it's gotten so bad that now crucial tech infrastructure is changing their code and introducing bugs and issues solely because some people might be offended by the term "blacklist". A phrase which, by the way, predates the use of "black" for dark-skinned people.
These kinds changes serve only to introduce ambiguity and to wholeheartedly ignore precision and practicality in favor of virtue signaling that doesn't actually address actual issues faced by disparaged groups.