Why yes, I believe the tool Logan uses is the Kotor Level Editor or KLE for short.
This tool allows Logan to place NPCs and placeables inside of a module within a week instead of a month as it was manually typing in coordinates back in the day. At this current stage, Logan has just about filled each and every module which will be part of the Episode 1 release with placeables AND NPCs and the current bucket list of "things to do" consists of mostly dialogues, scripts and side quests (This might sound bad to a non-modder, but this Unity tool has made development SO much better!).
Your questions regarding the Kotor Level Editor might be better answered in the Official KLE release thread down below: