Yeah I saw this too.
Goes hand in hand with the phrase: "The day you started lifting is the day you became forever small."
Although honestly this in and of itself isn't a disorder, the disorder is usually depression and anxiety or OCD, the training is just the scapegoat just like girls that think they're fat or people that think they aren't wanted, etc.
The concern here is people that start doing stupid things like juicing and insulining and syntholing and getting heavily depressed that they aren't big enough.
One of the ways people get better is by telling themselves that they aren't good enough. Some people however take that to the extreme.