AdrX003 Thats a dvar Treyarch left in the game because of laziness. However, the bots have no AI script regardless. Either the MP bot scripts need to be ported to ZM, or a bot script for ZM needs to be written from scratch.
The main issue with BO2 bots is a lot of the behavior is hardcoded in the engine so it may be difficult to make them work properly without a server plugin to disable all the bot engine code.
I made an attempt early on to see what I could make them do, but that was before the reason for the bots being broken on dedis was discovered so stuff like lookat() didn't work at that time.
Its something I might return to in the future though.