jackle
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I think he is alluding to the experience of "blue" rather than the physics of it.
I once discussed the implications of me seeing "blue" as someone else's "red" and seeing their "red" as "blue". Of course, we both learned the right word to say when the teacher pointed at the colour "blue" but perhaps we experienced the colours in a mirror symmetry, each opposite to the other. We concluded that we could not discern this scenario in principle. Blue is blue but I can't say anything about someone else's experience of it so long as they behave consistently with what I have learnt.
I once discussed the implications of me seeing "blue" as someone else's "red" and seeing their "red" as "blue". Of course, we both learned the right word to say when the teacher pointed at the colour "blue" but perhaps we experienced the colours in a mirror symmetry, each opposite to the other. We concluded that we could not discern this scenario in principle. Blue is blue but I can't say anything about someone else's experience of it so long as they behave consistently with what I have learnt.