The distinction is obvious: correlation does not include an ordering, but causation does. You can observe that two things both happened, and that is correlation

The distinction is obvious: correlation does not include an ordering, but causation does. You can observe that two things both happened, and that is correlation. You can observe that one thing happened, and then another thing happened after, and stipulate causation. You can increase your certainty by a controlled experiment. It seems like all the author is really saying is that experiments aren't good enough to produce 100% certainty of causation. Not all that shocking. But the author also seems to conflate correlation with uncertainty, and this is probably where the title comes from: increasing certainty from controlled experiments implies causation.