Couldn't he have organized the data better?
Do balls horizontally (0, 1, 2, 3), and go top-to-bottom for strikes (0, 1, 2).
The chart as it is takes unnecessarily long to read... not sure what is the order.
Also, would be interested to know:
1) What is the ML average for each count (as others have posited)
2) How many "takes" are there for each of these counts.