I am pretty sure about that, I have just tested that
.
1 - these ADTs are in WDT, but not in (ProjectPath)/World/Maps/(MapName) > so they are not existing or they are in MPQs in data path, which means they probably are not modded (unless they are not in MPQ made by user)
2 - these ADTs are in (ProjectPath)/World/Maps/(MapName)
3 - these ADTs are in WDL, but again, not in (ProjectPath)/World/Maps/(MapName) > so they are not existing or they are in MPQs in data path, which means they probably are not modded (unless they are not in MPQ made by user)
Simple and logical system.