It's from the September update
"First of all, our vaulting system is not built on predefined objects or locations in the map. There are tens of thousands of objects that should be vaultable or climbable in Erangel. To perform the action, the geometry and properties of each object have to be dynamically detected and analyzed. The algorithm is quite complex and requires rigorous testing and fine-tuning of the map."
They figure out an algorithm to make vaulting work on all existing and future objects, rather than addressing every single one specifically.