We know what causality is. A fully formal definition that encompasses all human intuition for causality isn't fully realized yet, but we know in general what causation is and we have been doing science to establish causation for a while now.
Granger causality is not actually causality. A time delay is required for cause and effect, but a correlation between two events can have a time delay as well.
Therefore seeing a delay between two events does not mean the first event caused the second event. But establishing causation between two events does mean that there is a time delay between the first and second event.
Causative experiments are much more rigorous then relying on the existence of time delay to establish causation. Medicine for example does not rely on granger causality.
Granger causality is not actually causality. A time delay is required for cause and effect, but a correlation between two events can have a time delay as well.
Therefore seeing a delay between two events does not mean the first event caused the second event. But establishing causation between two events does mean that there is a time delay between the first and second event.
Causative experiments are much more rigorous then relying on the existence of time delay to establish causation. Medicine for example does not rely on granger causality.