Well that is outdoors, it might work there, but well not in a non respawning area like Ragged Flagon I guess, not sure why it doesn't work.
And here is more info about the DISABLE console command:
Won't render the selected object (includes actors.)
The object will be made invisible, collision will also be turned off and AI won't process on the object, but scripting on the object will run. (Unlike Oblivion, where it would instantly crash to desktop, the player can't be disabled.)
So it doesn't delete the object but does what it says to do, it disables it, but how the hell should you remove the object completely...