The clock alteration measurements are a completely irrelevant red herring. As you said, there is no experiment which could possibly be performed which would falsify your concept of determinism. That is what it means to be unfalsifiable.You can falsify my statement that determinism is empirically proved by giving an alternative explanation for the clock-alteration of measurements.
Just because you can't falsify my thesis doesn't mean you can seriously neutralize it.
So your definition is compatible with any and all theories, including ones where clocks don't alter. Experimental results cannot provide evidence against your definition, therefore they cannot provide evidence for it either. Which is the reason why your definition of determinism is non scientific and completely useless.