Major leaguers all know the plate is fair. I would argue that pretty much every player in high school ball and above know it's fair. Teenagers in the Dominican know it's fair. It's not an oddity to hit the ball off the plate, either on purpose to get a big bounce to leg out an infield hit, or accidentally, like when laying down a bunt.
If Turner thought he hit the plate and it was a foul ball and thus a strikeout, MLB needs to issue him a lifetime ban for being too stupid to play the game.