The thing is about karma is that it is a samsaric phenomena - it is brought about by the ego-clinging self that is existant in samsara.
Once we are liberated it can be seen that the self is a delusion as is of course karma but we have to be liberated from samsara for this to happen
until hen we are subject to the self, the ego and to karma... ...enlightened beings who have transcended samsara are of course not subject to this, as there is no inherent self and a complete awakening to the emptiness of all phenomena.