I agree that we shouldn't comment on her weight, but I think the comment from the YouTube talking about her weight was meant to be from the perspective that Anna's body before was a product of her starving herself and having an eating disorder. That means that anyone that idolized Anna before and saw her as fit was actually idolizing someone with an eating disorder's body. So instead of Anna's new goal to spread positivity and awareness about these things, her opening up about it backfires because it teaches someone with a bad mindset that in order to get her previous body type you have to engage in disordered behavior.
In a way, Anna coming out with her story just justifies anyone that has an eating disorder, because it tells them, "Oh, if I want to look like Anna, I can just keep doing these disordered habits and I'll achieve that look."
In a way, Anna coming out with her story just justifies anyone that has an eating disorder, because it tells them, "Oh, if I want to look like Anna, I can just keep doing these disordered habits and I'll achieve that look."