I don't see fasting as a problem for someone who has truly overcome an eating disorder, and is no longer malnurished, but I definitely don't think it's a good idea for anyone who is still struggling with an eating disorder. Even a binge eating disorder can be a problem in fasting if the person can't control themselves after the fast.
It was a good idea for you to post those links, mouseclick. In fact, I think there needs to be some kind of warning in the FAQs for the Water Fasting forum making it clear that it is not the solution for those with serious eating disorders. Who knows how many silent victims are thinking it's ok to do since there's nothing up there to tell them otherwise.