Big Oil didn't "lie" about climate change any more than the people who think sentient dinosaurs live in Hollow Earth "lied" about the way to get there.
The global warming theories they were presented as a result of fossil fuel burning fall into to "not even wrong" category of pseudoscience. CO2 doesn't cover the Earth, causing warming like a blanket. That was the theory they were given. It's not even wrong. It means nothing. And they debated it, decided it was meaningless, and moved on.
The criminals in this are the people who continue to push global totalitarian rule to fix a fake crisis. There is no climate emergency. What we're seeing now is the 100-year global water cycle oscillation. That's it. The only difference is that this time we're able to observe the environment on a global scale.