Completely.
They are literally saying that because the "structural pathology" is unclear, it is therefore non-organic, the patients having bodily sensations which do not result from physical disease, but which the patients respond to as if they did. The long, horrific history of psychiatry and medicine in this aspect should have made them so sensationally humble and careful, but instead they stick to reasoning from the time of vapours, bloodletting and mercury.
What pisses me off about this type of papers, apart from their scientific weakness and with it distortion of real understanding of the illness, is that it's not intended to be helpful, it is intended to "prove" the origins of the illness are psychiatric to legitimize a CBT treatment. To keep fibromyalgia patients as part of the psychiatry domain.
It's weaponising trauma for its own end, pseudo-medical victimblaming. Which is such a malicious thing to do.