^ Hmm, curious.

So why isn't that what is (seemingly) presented on screen? If Moffat had no intention of opening this can of worms, why isn't it stated more overtly that this is
not the case, when nearly everything on screen seems to say it is so?
My bet is Moffat is covering his ass for contractural reasons.

He knows what a shitstorm would brew up if he suddenly declared that everything we previously knew about the series is now null and void. For one thing, there's loads of merchandise that carries specific branding ('The Ninth Doctor', 'The Tenth Doctor', etc) which would be invalidated, no doubt pissing off loads of consumers and marketing types alike. Am I right in thinking the recent Blu Ray boxset, for example, proudly states that it features Doctors 9, 10 and 11?
So he's cooked up this BS explanation for 'official' reasons, which all the same runs contrary to much of what is presented on-screen.