When I was very very young, literally 4 or 5, my family accused me of being anorexic. I am a very finicky eater due to taste and smell sensitivities, and when I'm wound up in something I won't eat.
All through my childhood, I was told I was anorexic and underweight, which was bizarre to me because I don't care about my appearance much. I just have a lot of trouble eating when I'm upset, my appetite does not exist at all, and certain smells and textures are just disgusting to me outright.
When I'm not upset by yelling, noise, anger, violence, etc., I eat fine. Grade and high school cafeterias were always very noisy -- I could never eat very much there.
I wonder what exactly constitutes anorexia in these autistic girls. Are they truly obsessed with keeping up appearances, as the usual writing on anorexia would give as the main reason?
Gender disphoria can also lead girls to calorie restriction, to prevent a curvy, feminine form. A lot of girls here say they feel androgynous or male inside.
I think before somebody makes claims about anorexia being exceedingly common in autistics, the reason for the anorexic pattern of behavior should be explored. If an autistic anorexic is not eating for a reason unrelated to how NT anorexics work, the usual treatments might not work or even backfire.