The language changes have been very deliberate and are intended to hide the reality of the situation. That includes, for example, the change from two terms (transsexual and transvestite) to one (initially transgender, now more commonly simply trans).
In addition, the language is changed with high frequency, and is then policed with maximum outrage. This is a tactic also designed to cause confusion. An example of this would be the insertion of a space into the word transwoman, which serves the dual purposes of allowing activists to berate all those who get it “wrong”, as well as the added bonus that they can begin to claim that “trans” is an adjective instead of a prefix.
If you notice a language change that has obvious benefits to transactivism, it probably isn’t a random accident.
There’s an interview somewhere, I think with Christine Burns where the change of terminology to “transgender” is discussed. I will try and find it later.