Training guide (Eating disorders)

I don't have an eating disorder personally however I took a look at the training thing for it and to me it seems to be overgeneralising. It talks as if the solution to all eating disorders (as in overeating and under-eating) is the same. I've heard that for people with under-eating type eating disorders they shouldn't self-monitor/record but in the training guide it tell everyone to weigh themselves once a week and to record everything they eat which seems a bit counterintuitive for someone under-eating. I'm curious what someone with an eating disorder or more experience with eating disorders thinks since to me it seems like it should treat eating disorders as a more nuanced thing. Have a nice day though : )