Likely the same way that the Doctor was able to hide Amy's memories of him in the wedding expression ("Something old, something new, something borrowed, something blue...") despite the fact that at at the time she starts to remember him, he would never had existed to create or hide those memories in any way.
That is to say, impossibly. Perhaps the Doctor managed to hide memories for her as well, albeit less important ones. All he had to do for River is make her remember to drop off a blue journal; Amy's hidden memories had to bring him directly into existence.
On some core level, considering it was possible for him to be remembered back into existence at all and the fact that the Universe corrected itself after his re-appearance (River's journal filling back up, etc.), it seems likely that he never entirely ceased to exist (the same way Amy had dormant memories of Rory after his "non-existence"). However, it seems the one thing that was not corrected was Rory's memories of being an Auton, as the real Rory was brought back and married Amy (but still remembers those years).
See http://tardis.wikia.com/wiki/The_Big_Bang and http://tardis.wikia.com/wiki/Rory_Williams for details.
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