Data is not finite.

Data has a shelf life.

Just take the myriads of studies done on Alcohol. It was proven many times over to be bad for you. Ok.

Then it was proven to have beneficial effects for some with helping with coronary artery disease, lower bad cholesterol, etc etc.

Then the concentration of blood/alcohol ratio allowed before it becomes impaired driving was revisited several times over the years and refined according to better health understanding of the human body.

What i'm saying is that not only does the univserse change, so does our understanding of it. And that impacts past studies and past truths we held as facts, often to a greater amount of certainty.