No, they're referring to the distance from the lowest point in the valley... so, yes, the plank over the well would be on-par with this Chinese innovation.
In all seriousness, the mountain takes care of that for them I suspect. It's probably burned all the fuel in flight and thus they just have to stand clear once it lands on the other side.
Using a rocket is probably much more cost effective and probably more akin to how bridges used to be made. I mean look at the rope bridges the Mayan's made, some are way too wide for someone to easily throw a rope across, so they probably tied a guide rope to an arrow and fired it across.
You can probably transfer a heavier cable using a rocket than a helicopter, allowing the real work to commence earlier. I mean imagine how long it takes to drag increasingly thicker cables over a couple of kilometers of ravine.
seems that even with the threat of the death penalty for company officials, it still doesn't stop shady practices