That's odd, but you can see in the SAR photo that there isn't even an outline of the awning, nor the golf carts under it, nor the columns that hold the awning up, but there are trees which aren't there in the photos from the ground.
While I can't find the image online earlier than 2010, there's an ieee research paper titled TanDEM-X for High-Resolution SAR Interferometry from 2007, so it certainly could predate the awning.