Oil industries downplaying the risks makes a lot more sense. If you think that climate change will happen, but it'll happen after you're dead, and you'll be able to leave your kids a big inheritance so they'll be able to buy their way out of the worst of it, and eventually the government will get the message and stop us all using fossil fuels anyway, then you try to profit as much as you can in the short term.

With AGI existential risk, its likely to happen on a much shorter timescale, and it seems likely you won't be able to buy your way out of it.