Bhashya
एष उ एव वामनीः, यस्मादेष हि सर्वाणि वामानि पुण्यकर्मफलानि पुण्यानुरूपं प्राणिभ्यो नयति प्रापयति वहति च आत्मधर्मत्वेन ।विदुषः फलम्-सर्वाणि वामानि नयति य एवं वेद ॥
In plain words
He alone is Vāmanī because, as his very nature, he distributes all desirable fruits of good karma to living beings in exact accord with their merit, carrying and delivering them. The reward for the wise one who knows this is found in the text: He leads all desirable things, who thus knows.
Close to the Sanskrit
This indeed alone is Vāmanī, because he leads, causes to reach, and carries all desirable things, the fruits of meritorious deeds, in proportion to their merit, to living beings as an attribute of the self. The fruit for the wise man: He leads all desirable things, who thus knows.