Well, you really aren't reading that 100% correctly. Look at the location of the vertical lines. They are at -1.0 and +1.0 feet from center, meaning the plate (as typically called by umpires) is 24" wide. This is what they do at brooksbaseball. The strikezone shown is the "usual" strikezone, not the regulation one. The regulation width of the plate is 17", and I'd put the black at no more than 1.5" wide, so anything beyond 10" from center, which is 0.83', is a ball per the rulebook.
If you look at the total game calling link, called Normalized Strikezone, you see the correct location of the regulation zone.
Link