That the same claims can be made of pain medications (and indeed most of medicine) was one of the primary points of the parent article - which makes me question

That the same claims can be made of pain medications (and indeed most of medicine) was one of the primary points of the parent article - which makes me question whether you even read it. Your second paragraph I don't know what to say in response to, other than that all the research I've seen indicates that there is no relationship between any of the (NHS or whatever) accreditation requirements and outcomes, or any that indicate that accredited therapists (by any licensing body) achieve better outcomes than those who are unaccredited.