You omit a key point. The oxygen event (initial uplift from near zero at 2.3Ga) is not directly related to plate tectonics. Instead, plate tectonics appears to have helped the oxygen boost at 1Ga: increased volcanic activity released large stores of phosphorus, which is required for photosynthesis, which produces oxygen.
You're attributing a statement of causality to me that I never made; I merely said that plate tectonics would make an earth-like exoplanet more interesting -- for exactly the reason you note: it appears to be a prerequisite for an oxygenation event.
