The problem with this kind of story would be that the authorities won't announce the exact nature of accident. Further stories could filter out of NK or China later about the accident. People can be careless and cut corners, even risking their life.
Chinese leader Mao Zedong’s grandson is still alive, according to photo. Mao Xinyu attended a seminar on May 4
https://www.taiwannews.com.tw/en/news/3423002