DeletedUser99588
You did not gain 10,000 happiness. You gained only half and the other half was given to you either by others or a kit. So youi did not meet the requirements.
Although I agree polishing shouldn't apply the wording of gain happiness is a little too ambiguous. When polishing (self aid) you are gaining extra happiness so can understand why some would feel a little peeved when it doesn't work. Although a minor issue maybe an easy one to clarify by describing what is required a little more clearly and if necessary include a point that polishing doesn't count.
Not a big deal though as you soon learn what works and what doesn't with these types of quests.