The body still persists (‘old kamma’) in Nirodhasamapatti. The DO is only one thread of causality.
It is mental activity, in the form of volition, that constitutes kamma, and it is our stock of kamma that steers the stream of consciousness from the past life into a new body. Thus the Buddha says: “This body, O monks, is old kamma, to be seen as generated and fashioned by volition, as something to be felt” (SN XI.37). It is not only the body, as a composite whole, that is the product of past kamma, but the sense faculties too (see SN XXV.146). The eye, ear, nose, tongue, body-sense, and mind-base are also fashioned by our past kamma, and thus kamma to some degree shapes and influences all our sensory experience. Since kamma is ultimately explained as volition (cetana), this means that the particular body with which we are endowed, with all its distinguishing features and faculties of sense, is rooted in our volitional activities in earlier lives. Precisely how past volition can influence the development of the zygote lies beyond the range of scientific explanation, but if the Buddha’s words are to be trusted such an influence must be real.
Phenomena cease in nirodhasamapatti throwing ontological reality into question. Yet things arise as long as the person is alive, suggesting it cannot be discounted. The journey, anyway, is not to find absolute truth, but dispassion.