What is the ruling on using the "God object" design pattern and the "ghosts" programming command in programming, both of which are considered "code smells," and what is the ruling on teaching them to demonstrate their harms?

Using the "god object" programming command is not forbidden (haram), nor is teaching such code to demonstrate its disadvantages. The refraining of non-Muslims from using it is not related to its name, but rather because it is a "code smell" indicating a design flaw that hinders application development.