OK, I get that but China does not inspect children's lunch boxes to see what food their parents sent them to school with. I think in China parents are free to send their children to school with whatever food they want them to have for lunch. Maybe I am wrong on that.
The view in china is either the school feeds everyone the same lunch if that is the deal with that school, or kids are expected to bring their own lunch or they don’t eat because in many rural schools there there are no lunch programs. The lunch program is mom and dad making a meal for the kid to eat at lunch.