As I read the linked article, it appears the original study was looking to see if the abusers fit into specific categories of behavioral disorders, and they didn’t. These categories are presumably the European equivalent of the DSM-V. Psychologists, therapists, and clinicians are very supportive of the methodology of defining these categories, because that’s how they get paid. In medical systems that are increasingly socialized, the insurance companies or state health care systems that track therapy for reimbursement like to have disorders defined in neat categories.
I don’t think that’s very realistic, in trying to understand the incredibly broad spectrum of human behavior and misbehavior.
The more Catholic (both big-C and little-c) view is that we are not defined by our categories - one man may have affinity for other men, and the Church recognizes that as a same-sex attraction which could derive from genetics or upbringing or early exposure to unhealthy influences, but he is not a “homosexual,” if that view requires placing him in a rigid box that says his choices and actions are defined by that category. He is, first and foremost, a man, a child of God, and capable of moral choice. Some of those choices may be good, and some not. Sexual behavior and preferences can be quite elastic in some people, and behaviors are inherently capable of self-directed change.
The problem comes when we try to describe human behavior using such semantic distinctions as “paedophile,” “sociopath,” “ephebophile,” and so forth, and begin to think the map is the same as the earth. You commonly hear a lot of nonsense bandied about in abuse debates, such as, “well, heterosexual males are more likely to molest boys.” No, people who molest boys are more likely to molest boys. Behavior is the truth, not psychological categories.
If we look at the research on those who have committed the most vile of crimes - the abduction, sexual assault, and murder of children - less than half test out for psychopathy. If we look at the research on prison rape, few of those involved as aggressors identify as homosexuals. Much of the sexual assaults on children are done by people who just enjoy dominating and hurting less powerful people.
Sometimes, people just choose to do evil things. Categories have little to do with it.
To say that this or that psychological inventory test described an individual as a “paedophile” tells us a little something about the risk factors attached to that person, but by the results of this test, we can only say the (unnamed) psychological inventories used for assessment are fundamentally flawed, or that such categories are essentially meaningless.