Yeah, this has been my fanon for what Bruce (and others) tell people the "official" story for Batman is for almost a decade.
Of course, he also uses disinformation (it's a fallen angel, a fallen demon, Gotham's Conscious, the dark subconscious reflection of the criminal psychopaths given form, there is no Batman, etc).
Aaron "The Mad Whitaker" Bourque; "No Batman? Then how am I talking to you?" I'm a figment of your imagination, of course. o.O ". . . What?"