Regardless of one's views on supernatural experiences, religion, or life after death, the arguments presented in the linked article must be rejected, because they are illogical, and very embarrasingly so for their authors, and also for their publishers.
In essence, they argue from the premise that the mere fact that a perception of having an experience can be triggered by an artificial stimulus to the brain, implies that the experience itself is never caused by anything in objective reality, and is entirely a product of subjective internal biochemical processes. But that conclusion doesn't follow logically, at all.
For example, we know that visual hallucinations can be triggered by artificial stimuli, but from that observation, it does not follow that light does not exist, and that those of us who claim to see things, such as this text on the screen, must be imagining it.
We also know from experiments conducted by electrically stimulating the brains of patients undergoing brain surgery, that vivid memories of childhood experiences can be evoked, having such clarity and vividness that they seem to the patient as if they were happening right then and there on the operating table, at the time of the experiment. But from these observations it does not follow that those experiences never really took place at all, or that the persons claiming to have had those childhood experiences were merely hallucinating when they were four years old, and thought that they were playing with their father.