Here is the full “Ānisaṃsasutta (AN 6.97)“:
“Chayime, bhikkhave, ānisaṃsā sotā¬patti¬phala¬sacchi¬kiriyāya. Katame cha? Saddham¬ma¬niyato hoti, apari¬hāna¬dhammo hoti, ¬pariyan¬ta¬katassa dukkhaṃ hoti, asādhāraṇena ñāṇena samannāgato hoti, hetu cassa sudiṭṭho, hetusamuppannā ca dhammā. Ime kho, bhikkhave, cha ānisaṃsā sotā-patti¬phala¬sacchi¬kiriyāyā”ti.
Translated: “Bhikkhus, there are these six rewards (anisamsa) in realizing the fruit of stream-entry. Which six? One is certain of the true Dhamma (Saddhamma). One is not never going to lose that grasp of Saddhamma. One has grasped what dukkha is. One is endowed with knowledge that is not known to normal humans (asādhāraṇena ñāṇena). One sees true causes (for suffering), one comprehends causally-originated (i.e., paticca samuppanna) phenomena.
“These are the six rewards in realizing the fruit of stream-entry.”
These are discussed at “Sōtapanna Stage of Nibbāna“.
Yes. A Sotapanna has seen the unconditioned (Nibbana), element. That is what the above sutta says.
One sees the unconditioned element (Nibbana) when one clearly sees how conditioned phenomena arise due to causes. Again, seeing does not mean one has completed the Path. One basically “sees” what is path is. Now one has to follow the Path.
But one is released from the apayas, because the causes for papa kamma or worst of the dasa akusala to arise have been removed from one’s mind just due that vision (Samma Ditthi).