। ॥ ३७ ॥
In plain words
Because there is, after all, a way to reach that world — even taking this second reading — this statement of the Veda about the sonless man is really there to spur him into performing the son-securing sacrifice and rites like it.
Close to the Sanskrit
Since there exists a means of attaining that world — even on the second alternative — for the sonless man, this statement of the Veda is given for the sake of prompting him toward the son-rite and similar sacrifices.