I have to imagine that very few people would make statements like this if we lived in a universe where there was any real danger of it happening. It would be interesting to talk to humans that have lived even a few hundred subjective years, if any existed. That seems to be enough time to lead to very different perspectives on something like immortality. Given the information storage constraints of our minds, I wonder if there is even some age that makes immortality subjectively different than very long life. We don't seem to be capable of remembering even a full decade of experience. By the time you reach a few hundred years of age, would you have any memories at all of your first century? You might not have experienced a single "death" event, but the "you" that was born may have long since died.