IATF did not make good work issuing Sanctioned Interpretation as now only internal trainer has to be competent. Sorry, there has to be kept evidence of his(her) competence. External trainer? Who cares?!
Several years ago I was witness of Quality Manager receiving NC for "internal auditor training certificate" presented to 3rd party auditor as evidence of competence of one of internal auditors. Nothing special, but training was provided by Certification Body this auditor was working for as full-time employee. There was no evidence, that training covered all topics which were elements of required internal auditor competencies.