Imo, seeing this suttas has anything to do with after-death is "seeing things that are not there". Mahanama asked the Buddha a question a typical puthujjana would ask. Namely, "what will happen when I die or what will happen after my death"? The Buddha did not answer his question by saying "Have no fear, Mahanama! Have no fear! Your rebirth will not be a bad one". He merely said "Have no fear, Mahanama! Have no fear! Your death will not be a bad one".
maranam means death. kalakriya means death.