@Noproblemo There are instances where bulimia doesn't lead an individual to become skinny. At the hospital where I worked, we saw cases of individuals who suffered from psychological ailments in addition to bulimia. There are instances in which they could only receive "pleasure" stimulation to their brain from eating. Thus, they would overeat, suffer from bulimia, and continue to overeat. In addition, with the significant amount of calories he or she ate versus the lifestyle they lived, the individual became fat.
The translator has correctly written the proper terminology for this article and has done a great job in explaining in the side note as to the wide range of conditions that span this disorder. My props to this scanlation group for bringing this to light.