twitter logic

Is E an example of the "Don't touch Goku" rule? (its best not to mess with the phenomenon?

I understand that we can infer that if Profits Increase then that must mean that Traffic Congestion decreased. I am confused when we get to how B must be true. B says that Profits Will increase If the cost of living decreases. How do we know then that traffic decreased? Isn't it possible that the cost of living can decrease and also still have high traffic congestion? What am I missing?