If they hadn't already implemented Questec I'd agree with you.
That shows me two things. One, they recognize they have a big problem with umpire inconsistency and inaccuracy which affects games and the quality of the product on the field.
Two, technology exists already which can identify the umpires who are least capable.
If they didn't believe in it, why would they even consider Questec?
And if they weren't willing to move past their old school prejudices, why would they be using it now?