To me, this looks like a contrast between two modes of writing fiction. We know what novels do. Interactive gaming provides a similar experience, but with the added thrill of deciding which way the story will go. LARP goes a step further by turning player roles into lived experiences in the fullest sense. From a writer's perspective, both gaming and LARP reduce or eliminate one of the main dimensions of written fiction--internal monologue.
In response to this article, especially to the idea that one of its subjects fell in love with a woman who was also a player, but she did not really exist because she existed only in the game, I think this is a wonderful idea for a romance or sci-fi/romance story in which people, already married but not to each other, meet while playing a LARP long weekend, fall in love, and then try to sort it all out.
Obviously, the man in the article spent a few days as an actor in a LARP. He fell in love with a female LARP actor while they were in the LARP. He could not deal with this, so he decided she was not real. She did not exist outside the LARP. He became an unreliable narrator telling a distorted version of what happened, and the reporter bit. The reporter said she did not exist. But she did. And she had a life outside the LARP.
The reporter believed his BS and wrote it as truth.
At the same time, the subject of the story knew the woman was real. She knew he was real. Their spouses knew nothing of this. They both lived IRL, probably nearby each other. If they had children, perhaps they attended the same school or preschool, went to the same church or had other deep social connections full of morality, guilt, and consequences.
Where does this go? Do lovers find each other IRL? Do spouses deal with this? A foursome marriage? I am rooting for the third option.
Just putting this out there ...