We are not all anorexic. A person with anorexia severely limits food intake, has a distorted body image, refuses to maintain a normal body weight, and is intensely afraid of gaining weight, despite being very underweight.
Wanting to gain lean mass is not anorexia nervosa.
Having a dietary plan is not equivalent to being anorexic. Plenty of endurance athletes eat to maximize performance-- I eat to maximize my body composition goals. Not a disorder. I have a goal, I posess the information and tools I need to achieve that goal, and I follow it to success.
Also I am a little confused as to your last statement. Are you implying that no powerlifters have dietary plans or body composition goals? I have been competitive in powerlifting at sub 10% bodyfat levels, and one of my good friends recently dieted down from the 181lb weight class to the 165lb weight class and broke the national Bench record.