This is a rather empirical viewpoint.
There is this one example of the apple from Politzer's book.
"Before that it was a green apple; before being a flower, it was a bud. In this way, we shall go back to the condition of the apple tree in spring. The apple has not always been an apple: it has a history. Likewise, it will not remain what it is. If it falls, it will rot, decompose and scatter its seeds, which will, if all goes well, produce a shoot and then a tree. Hence, neither has the apple always been what it is nor will it remain what it is."
If I were to translate this into the view of trans people, the following would be that a trans woman is defined as a human who at first was born a man and then through medical transitioning, became a woman because it was not always a "woman".