Second, the soul is not, on the Aristotelian-Thomistic thesis, a "supernatural" being, as an angel or God would be since (though not material themselves) they properly belong to the material order.
So these are natural, not supernatural explanations, which nevertheless go beyond the purely material (corporeal) and so are 'above' them. In the quoted article, he means that these characteristic activites of living things are not simply reducible to those of the material parts themselves, since the living thing possesses the principle of its own organization/growth/reproduction etc. that non-living material does not, so something beyond the non-living 'corporeal' order must be operating.