I consider these portions of the article "proof", or at least convincing evidence:
"Todd Burpo, Colton’s father, says he was skeptical about his son’s story until his son described meeting a great-grandfather and a miscarried baby sister — something no one had ever told him about."
"She never told her baby about God, Jesus, her near-death experience, nothing. All that happened when the girl was 8 weeks old. How could she remember that?"
So when someone tells about a supernatural event, my default position is that it didn't happen, until there is actual evidence. You might call this close minded but I call it the only sane way to approach things. You can take another stance and just go into the "conspiracy theory" communities and end up believing that the government is out to kill most humans, that the government are shapeshifting reptilians, that the illuminati control the government, that the government is trying to control you with fluoride in your water and toothpaste or with chemtrails or that vaccines cause autism.