Regarding that documentary I would like to point out the lighting angle from a parallel light source can create such shadows depending on the focal length. Of course, maybe some uneven terrain is involved but if you assumed totally flat you could still reproduce this, I did a quick version in blender (when I say quick I mean I didn't measure anything with distances or what the actual sun angle was, I just eyeballed it to show the point). I used a directional light in my scene, meaning the light source is simply coming from a single direction and never comes to a single point, thus best simulating as if the light source was extremely far. The results in Blender show the shadow of the far away object being almost perfectly horizontal while the close up objects shadows aren't. Again this was super rough and I don't know what the focal length, camera angle or distances of things etc were in the actual photo, I just wanted to illustrate this point. If the terrain is uneven and the objects casting the shadows aren't super basic cubes then the shadows would vary even more but for my test I just used basic shapes on a totally flat surface. I'm sure if I had more than 5 minutes on this I could replicate it exactly but time is money.
If I really ramp up the focal length it creates even more seperation. Notice now the far away object shadow is totally horizontal while the objects close up have even more extreme shadow angles. I didn't move anything or change anything other than focal length.