No, it means that a person's choice of dress determines gender identity. There was a story a number of years ago about a pair of male twins in Canada. One twin had his penis burned off by a machine that was supposed to circumcise him. At the recommendation of doctors, his parents decided to raise him as a girl. Despite being forced to wear female clothing all his life, he continued to self-identify as male. In his teens he gave up his female clothing and lived the rest of his life as a male. He even married a woman. Unfortunately he died by his own hand at much too young an age.
CK
To add my own two cents worth, I think that all crossdressers are transgendered in the sense that they view themselves as belonging to the opposite sex. Not all the time, and perhaps never 100%. There are people who claim otherwise, and say it's nothing more than a hobby. I don't believe them. I think that these people are lying because they want to keep that part of themselves private, perhaps even from themselves. I respect this desire, and politely pretend to believe those who tell me that crossdressing is their hobby. I don't see any reason why a person shouldn't be allowed some privacy. But I won't ever believe it.