No, actually, Bluff does not make a person flat-footed. If it did, my Iaijutsu master would indeed be very happy. Flat-footed is a specific condition that happens only in very specific circumstances, and that inbludes not only denying your dex bonus to AC but also disallows one from making attacks of opportunity. Feinting makes the defender lose their dex bonus to AC but does NOT make them flat-footed...it may not be a huge distinction, but it is a very important one (and one that keeps Iaijutsu masters from doing +9d6+9xChrmod 4 times a round with little chance of failure).