Sorry homonuclus, you misunderstand.
The narrative can be wrong and therefore ultimately what matters is the trace itself as interpreted by a Cardiologist.
However the CAA allows ECGs which are either reported by the computer as normal or have an acceptable code can be accepted for certification purposes by AMEs who are not Cardiologists.
However if there is a different code that ECG needs to be interpreted by a Cardiologist acceptable to the CAA.