Well no. The rule itself has changed several times over the years. It now reads:
> The official strike zone is the area over home plate from the midpoint between a batter's shoulders and the top of the uniform pants -- when the batter is in his stance and prepared to swing at a pitched ball -- and a point just below the kneecap.
https://www.mlb.com/glossary/rules/strike-zone
Which, when you think about it, isn't really all that precise. Where exactly are the shoulders in a stance? How is a "kneecap" measured? What if the batter hops around a bit when he swings? I hate to break it to you, but the robo-ump is probably guessing too, at least on the high and low calls.
And it's not so much that they call the rule differently, but they are human and see the strike zone differently.
B
