If anyones interested in the real
Requiring seats to be in an upright position for takeoff and landing is due to the breakover safety feature of the seats.
In a sudden decceleration, with the seat in the upright position, the breakover mechanism will allow the seatback to pivot forwards thus reducing the risk of the upper body/face of the passenger behind striking the seatback.
To achieve this, in the upright postition the recline mechanism the seat is back is prevented from moving backwards, but, due to the breakover it is free to move forwards.
If the seat is reclined (even slightly) the recline mechanism locks the seatback in place, in a sudden decceleration the passenger behind will more than likely injure themselves as they are thrown forward.
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Photo © Alastair Bor
You can see in the above photo that some seatbacks on the left are folded forward. In this case they have been deliberately pushed forward to provide more space, and its a design feature of the seats - western airline seats don't have that feature, but you see the idea. Obviously the seats wouldn't go that far forward in a sudden decceleration if there was someone sitting in it