Being a secondary school teacher and tutor, I can well believe that 2 interested 14 year old girls could write this.
And, as mentioned by @ScrollingLeaves I'm a science teacher, and have had explicitly* teach my year 7 (11-12 year olds) that no, humans can't change sex, and even if you have surgery, it's only cosmetic and the parts aren't functioning. And no, when a boy/man starts taking oestrogen, he doesn't grow a womb and start having periods. And no, if a girl/woman has a bilateral mastectomy, and changes her mind, and gets implants, she can't then breastfeed her baby. Oh, and that DSDs are rare, many people affected by them prefer to not be called intersex, and that those people are male or female, with a developmental disorder, not examples of a third sex.These are all examples from one class, in one week, this year.
And it has been getting worse, for the last 5 years. Very occasionally asked about 15-5 years ago.
By explicitly*, I mean clearly, with scientific definitions, and biological facts, not graphically.