http://wiki.roblox.com/index.php?title=API:Class/PathfindingService/EmptyCutoff
This property sets the percent of a voxel has to be occupied to be considered empty
Suggested phrasing would be something along the lines of:
This property sets the minimal percentage of volume inside a voxel that has to be occupied for the voxel itself to be considered occupied
EmptyCutoff is not used by new pathfinding implementation; we should just deprecate it.
In regards to the original post here though, even a deprecated feature will still have a description, which in this case, could be reworded for clarity.
Already is deprecated, someone needs to tell @UristMcSparks to update the API Dump…
(it’s literally like 2 weeks behind, what is going on, someone pls give me my job back 
)