We are confusing causes with symptoms. Anorexia may well be caused by deeper problems with the person's life, the ones you list in the quote, general sources of depression. However "anorexia" refers to a form of depression that manifests itself in issues with eating and weight. It is not the depression that kills patients, it's the undereating and the vomiting. Therefore it is entirely appropriate to discuss, deal with and treat the eating/food/weight aspects of anorexia patients' lives. When looking to actually cure the patient, therapists will indeed look to deeper issues in the person's psychology/environment. These will likely be specific to the patient, and so it is not really productive to discuss them in general terms accross populations. That can be dangerous, this kind of thinking is what lead to the concept of the "schitzogenic mother."
Also, this quote shows a big misunderstanding:
"Things that no amount of dieting or weight loss can cure."
Nobody claims that weight loss can cure anoreixa. Anorexia is basically the irrational desire for weight loss. Being cured of anorexia essentially involves stopping ones extreme irrational weight loss behaviour, and it is self evident that no amount of weight loss can cure this.
Sure, you might say the screwed beauty ideals are a symptom. What I was saying is that they are not the cause. And of course the starvation is a problem that has to be dealt with. How is maybe another issue best left to the specialists.
I think you misread that last quote. What they say is that the anorexic persons are not actually striving for some ideal weight that would make them satisfied if they would reach it. So they say precisely that it is not some specific beauty ideal they strive for.
They only wrote it like that because that is what it might look like from the perspective of the anorexic person (if only I could use so much weight, I would be OK).
Anyway, I think we have settled this as far as amateur knowledge permits.
Also, this quote shows a big misunderstanding:
"Things that no amount of dieting or weight loss can cure."
Nobody claims that weight loss can cure anoreixa. Anorexia is basically the irrational desire for weight loss. Being cured of anorexia essentially involves stopping ones extreme irrational weight loss behaviour, and it is self evident that no amount of weight loss can cure this.