If you look carefully, the moving image of the bulldozer is overlaid on a still photo of the house. Notice the relative scales of the bulldozer vs. the house. All the bulldozer is moving are some piles of dirt.
Another way the ad is dishonest.
You have an eye for detail. I just think it’s a mistake for Cruz to A, lie, and B, play the class warfare card against Trump. Even if there were short term gain in it—which is far from clear—it is disastrous in the long term. You can’t be the conservative candidate of integrity on the basis of lying and invoking class warfare.