Again, difficult to answer. Because off the pre-set pull settings, a guy giving up a 3 run homer on pitch 80 will get pulled. Of course, if he's pulled at pitch 70 due to the lower PC, he never throws that gopher ball and his stats will be better. Does that mean he was fatigued, and less effective, 10 pitches later? I don't know.
Personally, I think that's the case. That he was less effective at pitch 80 than he was at pitch 70. So, by reducing PC, he suddenly "became" a better pitcher.