It's the same line of thinking as transphobes...

No it's not? You're saying things that don't make sense, if you're assigned female at birth you have ovaries (assuming no intersex condition) if you're assigned male at birth you have testicules (assuming same thing)

The ovaries produce estrogen (in three different forms E2 is the most important) And progesterone. The testicules produce testosterone and testosterone can decay into dihydrotestosterone (DHT)

If an individual has more estrogen they will have a female phenotype (essentially they will look like a woman have breasts soft skin etc...)

If an individual has more Testosterone and DHT they will have a male phenotype. ( More strength, stronger jaw, more body hair, going bald in a lot of cases)

I'm a Trans woman, the point of hormone replacement therapy is to take my testosterone away and give me estrogen instead, after a while (and possibly some surgeries for bone structure) I'll look like a woman, because that's what hormones do. In the same vein since I don't have T in my blood anymore I am losing strength, and my body hair is getting thinner (although if it could hurry up a bit!) there's nothing transphobic about acknowledging that happens, it's literally the desired effect!

If you're still confused about NB people just know that some do take cross sex hormones to achieve a more androgynous look.