He was never going to reveal how he did it because in doing so he would be revealing how he does other tricks. The most amusing thing is that group of 24 who seem to actually believe they did it.
And did anyone note the "accidental slip" in his alternative explanation when he referred to she when describing the insider at the lottery. So were we meant to take that in at a subliminal level and thus believe he had given away more than he meant to.