। ॥ ६६३ ॥
In plain words
"Happiness is just the absence of pain" — that is what the earlier objector claimed. He has never once caught the scent of the Upaniṣads. His words are hollow, and they are false.
Close to the Sanskrit
That which was said by the earlier disputant — by one who has not smelled the Upaniṣad — namely, "the absence of pain is happiness": that is substanceless, a false utterance.