If Oscar and Oscar− are wholly co-located four-dimensional entities at t', the claim of distinctness collapses into a violation of the Indiscernibility of Identicals, not a vindication of it.

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co-located(describing the relationship between sounds and the events that produce them): Existing in the same place at the same time; occupying the same physical space.
distinctness(Śrīharṣa's Advaita Vedānta epistemology): The property in virtue of which an object is recognized as distinct from another
four-dimensional entities(perdurantism / four-dimensionalism in the metaphysics of persistence): Entities whose parts may extend in time as well as in space, such that persistence is analyzed as having different temporal parts at different times
indiscernibility of identicals(Leibniz's Law as applied to the identity vs. constitution distinction): The principle that if two things are identical, they must share all the same properties; constitution (unlike identity) does not conform to this principle

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