ftm transgender people still get period symptoms iirc, the question you should be asking is "what is the message an article like this is saying" and it's basically crap science.    modern usage generally uses gender and sex interchangeably however gender still has valid definitions in biology, sociology, and psychology. when people focus on saying that only ONE definition is the RIGHT definition, honestly i feel like that's just promoting ignorance, but I'm just some assclown on the internet