US-P18.040ab ।US-P18.040cd ॥
In plain words
That Rāhu is a real thing was settled earlier, on the authority of scripture. But if you hold that he is only a shadow, then by the reasoning already given he turns out to be no thing at all.
Close to the Sanskrit
Rāhu's being a real entity was established already before, on the authority of scripture. But on the shadow-view, his non-entity-hood would follow from the earlier reasoning.