Why would an explanation be removed? Perhaps the man who created Dogbert is content to let the... uh... less quick witted? ( no offense... l mean here specifically) miss out on the fun. That way he can tell himself he writes to an intelligent audience. Personally and as a teacher, l don't mind explaining -- IF it is requested first.
It appears the explaination was removed, so I will re-add:
The vendor could not get a date with Alice any other way, so he offered to meet her in a social situation under the guise of a business meeting. If things go according to his plan, very little business will be discussed.
Dilbert and Wally want to know if that tactic will work for them as well.