। ॥ ५९७ ॥
In plain words
He reports it himself, out of his own experience: during my deep sleep there was nothing there. Then, never once looking at his own presence in that nothing, this deluded man declares that he too was void.
Close to the Sanskrit
He himself indeed speaks of the state of voidness that abided at the time of his own deep sleep, experienced by himself; there, not having looked at his own existence, this deluded one declares voidness even of himself.