Correlation yes, as it means that it has a connection between both, but the cause might be a third thing (like a divestment from science, etc..). But the title

Correlation yes, as it means that it has a connection between both, but the cause might be a third thing (like a divestment from science, etc..). But the title "ban of the printing press LED to the decline..." implies causation, which is not a conclusion you get without more facts. Both happened at the same time, but we cannot conclude that banning the printing press caused the decline. The printing press ban might just have been another symptom of the overall misgovernment that generated the decline.