If blue-patch experiences are not distinct from their objects, then two observers reporting divergent experiences of the same causal locus cannot be explained without reintroducing external object-types as theoretical posits.

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Theoretical posits(referring to abstract objects like numbers in math): Things that scientists or mathematicians assume exist or propose as explanations, even though we can't directly observe them.
blue-patch experiences(as used in philosophy of mind): The subjective feeling or sensation you have when you see something blue—what it's actually like from inside your mind, rather than just the physical blue object itself.
causal locus(as used in metaphysics and causation): The specific place or point where something actually happens or causes an effect—basically, the 'where' of what's going on.
distinct from(Modal metaphysics; recombination principle (Premise 4)): A relation that must mean something stronger than 'not identical to' in the context of the recombination principle, so as to exclude co-obtaining incompatible states of affairs

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