IMHO, a true Pinball Wizard is ANY human being that can walk up to ANY pinball machine, start a game with 1 credit and leave it with more than one credit on the machine when the game is completed on a consistent basis.
My son has a couple pins in his gameroom and can NATURALLY beat any competitor on them because he has played the game many, many times. Does this make him a Pinball Wizard, NO! Though he is good...............
I can go into his shop and play any working (usually between 6 - 10) pin that I haven't played in months (or years) and walk away with free credits on the game, and most times bored of the game already (most recent ACDC)......... have been able to do this since I was about 10.