The commentator was comparing the break success in Hsu's semifinal match against Teutscher (ongoing at the time) versus Filler's semifinal match with Wu. Hsu was successful on 7 of 9 breaks in his semifinal, whereas Filler was successful on 5 of 10.
In the other streamed matches I have tracked with Filler and Hsu, successful breaks were:
Filler -- 5 of 8 against Hohmann and 4 of 10 against Chang
Hsu -- 7 of 10 against Juszczyszyn
So Filler's 3-match total is 50% (14 of 28).
And Hsu's 2-match total is 74% (14 of 19).