Don’t see how the dealer could cause the ball to drop at different point. The ball drops when the speed drops.
Maybe you notice it as a dealer but it could be more people at the table wobbling it. Some wheels are equipped with devices to change tilt. It reduces need for leveling it.
I remember years back the wheel has 90% hits to one diamond for more than 20 spins, but when I come back after 2-3 hours it was levelled. I have no idea how it could happened.