I ran across this today when trying to find a paper on Google scholar. While it sounds interesting, there is no use of pitch location data as far as I can tell. Mostly, it seems to report ball and strike percentages and ultimate game outcomes, with a profile for each umpire. Certainly interesting to see, though I provided much of this for free in one of my previous posts (with pitch location information included). For those, see HERE and HERE and HERE.
Anyway, thought some visitors may be interested.