I have developed some suspicion that they deliberately created an aerodynamic shape.
Look at the yellow cushioning under the iPad. It almost looks like a “lifting body” profile to me, an aerodynamic shape that creates lift. The tracker (or whatever the cylindrical thing is) below and the metal rod probably act as weights to stabilize it even more, making sure it always is belly-down. At any rate, this orientation maximizes drag and minimizes fall speed, and turns the iPad into a “wing”.
If you look at the video of the descent, the iPad appears to be actually gliding down. Look at the way it comes down for example.
Below are three snapshots from the video, the last just seconds before “impact”, showing how it behaves aerodynamically: from a certain altitude onwards it is always level with the horizon, gliding down rather than “falling”:
In fact, given that on a per-frame basis the image just before landing isn’t that much smeared (see 3rd picture above), this shows you that it made a “soft”, slow speed landing. Not a hard impact.