I agree that this is not out of the ordinary for Exxon.

Available documents show a discrepancy between what ExxonMobil’s scientists and executives discussed about climate change privately and in academic circles and what it presented to the general public.

This excerpt from one of the studies you posted shows that they were certainly not publicly vocal about it, though.

That’s not decades of time.

They did manufacture doubt about the scientific consensus, they did fund entities advancing climate denialism, they did lobby against regulatory measures. That is decades of time. Publishing climate change papers in the 70s does not absolve them of the crime of covering up the same information obtained through those papers.