It is no coincidence. In a secluded and tightly-knit community like Plant 404, an extreme event like this would immediately spread throughout the entire area.
The author you mentioned is Li Yang. We know each other, and our parents know each other as well. He published his piece before I did. Since the person involved was his classmate, he was able to provide more first-hand details, such as the part about riding a bicycle to see that boy.
When we had safety education at school, the teachers would still use examples from twenty years ago—like someone getting hit by a car. This is how it was in the plant: once something happened, people would keep talking about it for twenty years.