Sorry I don't really understand your explanation. Are inverted T waves in only V1 and V2 characteristic of ARVD? I have met other ARVD Criteria (# of PVC's a day with LBBB morphology and localized aneurysm on RV Free wall).
They are still of diagnostic significance, there is no prognostic value. The ekg pattern is really what initiates further workup in the right setting. One the diagnosis is made, typically by an MRI or heart Bx, the T waves really play no role.