Since the soul often refers to the core attributes, i.e. the soul of the matter, the most likely understanding is the human soul refers to the core attributes (personhood) of our human spirit, rather than the other way around.
Thus the human attributes of Christ, were fully attributes of His incarnate divine spirit, just as our human attributes are fully attributes of our human spirit.
Thus the human attributes of Christ, were fully attributes of His incarnate divine spirit, just as our human attributes are fully attributes of our human spirit.