Hmm, I just don't see why it needs to be stated.
If it says MALE ARTISTS people should know that they are all males. I go to the Female artists thread and I might think to myself "this girl looks like a guy, all of the Japanese men look prettier than her" but I know it is still a girl because it's under the female section lol. I dont need it to say "that goes for Japanese women who look like men" to figure that out ha.
Only some of the artists wear female clothing. Most of the guys just wear makeup, but they still wear clothing that can be worn by men.
IMO I don't think they are transvestites. I don't see why it is even a big deal for a man, especially an artist, that is in a visual band, to dress up!