... justify their beliefs about patients based on presuppositional recursive arguments or a partial mix of false pre-establishment augments and presuppositional recursive arguments.

... they believe it is entirely rational to make false claims of objective truth... based on assuming that the patient is assuming.

I'm not sure what these are supposed to mean.

In any case, I think I got the gist of it, but please correct me if I'm misunderstanding something — you believe psychiatric diagnoses are based on assumptions irrespective of patient experience, which is often dismissed as being a symptom of their diagnosis?

I think that's mostly valid, but I do disagree that mental health treatment is the only medical specialty that makes diagnostic assumptions, and is prone to misdiagnosis. Neurological, digestive, autoimmune, cardiac, pulmonary, etc. are all commonly assumptive with a high incidence of misdiagnosis. Just like how psychiatrists tend to overemphasize the genetic factors, and psychologists overemphasize the environmental factors — medical professionals tend to overemphasize their relevant expertise when diagnosing patients.