You can see the difference in height and fore/aft location between the new position (low, rearward) and the old. Seems its quicker!
Should add that the ‘shadow’ is in fact the previous position, with the bike in exactly the same location and the same size.
Photos taken using the outstanding (and free!) iOS app called Ubersense! It allows you to capture two videos of a similar scene and superimpose them, panning and zooming one video until the two line up perfectly. With bikes it is easy, you simply line up the wheel centres and top tube. You can then play with the opaqueness of each to create a mix of the two. Genius!