He have 2 zero Gravity.
And he not use This to many times.
Only use in the end part of the duel.
And at This point. You already have the trap jammer or something that have the same efect.
In fact, while his monsters have higher ATK than Unhappy Girl, he doesn't care about being blocked. AI always works like that in Duel Links. Using UG is possible, because he won't use his trap card.