I don't think he's ever officially committed to the idea of an existence of a "Prime" universe. I don't know what the Japanese fanbase even calls such a thing, if they even have a term for it, but I'm sure they're aware of the general idea.
But as the author, he hasn't to my knowledge gone so far as to actually suggest there is a "real world" at all. Oh, he's shown Ikuko and stuff, but he hasn't entirely gotten in bed with the idea that she lives in a Prime universe and that the Ikuko he's shown us is Ikuko-Prime to begin with. Hence my joke theory that everything is in Meta-Touya's mind, Ikuko has been Featherine the whole time, and Rokkenjima and everything associated with it didn't exist until Touya started inventing it under Featherine's direction.
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