Strongly disagree; he doesn't know what he's talking about. In his demonstration he only cropped at the closer distance, and then compared that crop with the optical zoom from farther away. If he had also cropped from that distance and compared with the optical zoom the mavic in the background would have been the same size. Maybe more in focus because of different depth of field, but not any size difference. Perspective and compression is a function of distance, not focal length! I cant believe how many people get this wrong! So once again, yes, you can do the dolly zoom effect in post, so long as your camera is moving closer or farther away during the shot, and the foreground to background scale shift will be identical. The only difference would be that with the optical version the background might get a little more blurry, but only slightly because with a small sensor and long distance away depth of field is very deep even with a 48mm equivalent lens..