I guess I have to agree that superiority over others would require a lack of heart. If it is indeed a statement about ego and the inferiority inference towards others. Those who have emotions and feelings towards others and the positions they are in would not feel a sense of superiority but a sense of empathy.
If it is meant in another context, well the word superior still infers a supreme status over others. Matters of the heart usually fall under the emotion category. Such emotions: love, friendship, empathy, kindness, and concern usually are in conflict with the descriptions of superiority. Superiority could be expressed in ways of material success or skills and talents. I think that an ego or just a general sense of feeling elevated in position of others to that degree is not in line with matters of the heart but a lack of matters of the heart.