The scenario does not say "great" but above average pitching. Great pitching would win but in this scenario the above average hitting beats the above average pitching and even if it doesn't, it's a lot more fun to coach.
For 10U or for a 12U rec league I can believe this. DD #3 usually pitches about 2 innings for 12U rec leagues, and averages about 5 K per outing. She's gotten as many as 8 K in a 2 inning outing. Dropped third strikes and all that.
At the TB level, much harder to get the Ks against girls who really know how to hit. I've seen DD throw pitches that would be strikeouts in rec ball that were in-the-park HRs when top notch batters were at the plate.
Pitching will win as long as you don't make mistakes on defense. It requires you to be perfect. But you can hit well, allow the other team to score a few, and still win.