Scientifically, I would suspect it has a psychological reason, the need for comfort.
As a Christian, I feel it is God's way of letting the departed comfort those who miss them (probably God uses the natural psychological quirks of the brain to do so, so these theories are not incompatible).
However, the pseudoscientific "explanations" in the rest of the article are pure nonsense.
They are not science.
And they deliberatly deny any concept from Judeo/Christian or even Muslim belief systems to explain there is life after death.
Essentially the article is propaganda for the religion of New Age. Beware.
I appreciate the warning. However, this kind of stuff has been around for ages. I, myself, have had three near-death experiences and the visions and sensations were very vivid and real. Still, I don't rule out brain physiology and natural chemical secretions, along with conditioned thought processes, as the cause. In this article, a couple of the recited experiences seemed more than just coincidence and that was my comment.
On other occassions I have experienced things that seem a direct answer to prayer, answers from "out of nowhere" which couldn't have been anticipated. Coincidence? Maybe.