You - and most people from the modern era - are measuring the verifiability of such experiences and accounts according to what is known as modern science, logic, solid, palpable facts. There is no (commonly accepted) branch of modern science that deals with near-death experiences or the afterlife; anything beyond what is solid is called 'belief'. In fact I think it's not exaggerated in any way to say that science was developed for the living. So how do you determine the realness of something using tools that were not developed for that particular area? As I said before, there's always what you feel resonates with the truth. Or if you wish to believe there is nothingness beyond death or simply state 'it can't be known' that is fine but you can't tell anyone that daring to use one's own intuition regarding one's own experiences (or those of others) in order to further the understanding in this area, is false from the beginning.