Knowing about your death argument
Mortalists do not believe that they have consciously existed before this present life time. But others have the belief that they remember previous life times. The science of superimmortality predicts that to have a belief or a memory what is required is to have the brain have certain structures and then function in certain ways. The mortalist's brain is not structured to have memories of previous life time experiences at least not strongly enough to make them think that they have had previous life times. But on the other hand having memories of events that one thinks was produced in another previous lifetime does not mean that this has anything to do with actually existing in another body before the present lifetime. Where it is true according to the principles of superimmortality that other bodies can produce your ixperiencitness and have many different life experiences there are not supernatural connections between previously existing bodies and your current body that ties you into one singular self. If you actually have memories that you think came from previously existing bodies you would be wrong in the sense that there is a physical continuity with this previous existing. If advanced scientists took a previous existing body and took the structure and functioning from that previously existing body and had some of the right structures and functionings reproduced in your current body certain memories could be reproduced of this previously existing person in you that you would experience. There would also have to be something in the structure and functioning in your body that would make you think that you had not experienced these memories with your current body other wise you would think that they were your bodies actual memories.
This in not the only way that a brain can think it is connected, by memories, to a previously existing person. There are natural ways that a brain can produce certain structures and functionings that produce these beliefs of having a previous life.
The brain can be structured and then function in such ways as to believe that it has had enumerable previous lives. These previous lives may or may not have existed in the past but you could have been connected to them through not bodies but by the same ixperiencitness.
According to superimmortality there can be any number of different bodies that have existed in the past and had your ixperiencitness produced by them. You are connected to them by the fact that you experienced each of these lives and likely the death experiences of many of them. There is more knowledge to a death than just experiencing the last moments of their life. There is the externasection and the physasection connected to each death and when you are dying you are not likely to catch all of the external circumstances that are happening when you are in pain and other things happening to your body like bleeding out etc. In your current body you could experience these death experiences of other people that are more realistic or aware of their surrounding and their death than the original dying person actually experienced.
Having memories of a previous life or even memories of dying is not proof of the existence of only one previous life or of the existence of any previous lives. However, there can be many different types of connections between previous existing structures and functioning in previous existing brains and your present brain, so that you think that these previously existing people actually existed and you are a conscious continuation of them in your current body. Superimmortality predicts that continuity of structure and functioning in a brain does not have to be sequential in time so there can be people that you think have died in the past and you are the reincarnation of these people when in fact they have not existed yet but will in the future sometime. As a result you can have memories of people's life experiences including memories of their death, that have not yet existed.
How is knowing about the death of other previously existing people through the production of memories of these death experiences an argument for superimmortality when the memories do not have to connect to any actual previously existing person or persons?