I'm guessing your records are in a database somewhere and the fact that you were a JW came up. Maybe he was just trying to feel you out and see if that was still your position? As far as saying that most JW's relent and secretly take some blood, I'm not sure if this is true. Perhaps he was just saying that in the hopes to sway you because he thought you may not be a very devout JW who was sitting on the fence?
I had surgery a few years ago, and the anasthesiologist told me he had NEVER seen a JW who recanted on their position on blood at the last minute. I'm inclined to believe him judging just from the experiences of the JW's I know.
Cog