to be clear there are billions of deaths that fit into his prediction.
That's not clear at all. Claiming 25%+ of the world will die is the kind of hyperbolic doomsday claim the Gates is trying to move away from because it distracts from sane climate mitigation strategies.
The plague did wonders for us, didnt it? Of course dead people arent livivng or thriving, but if they leave behind a world that has more job opportunities, housing opportunities, cleaner environments, quality food for less....
There have been historical cases made that the plague was a driver of a series of follow on events that upended the previous order - so people like Gates sitting at the top of the current world order might not want to be so blase about the effects of climate change
Ahh yes the Thanos argument
It is very hard to gauge what he actually believes will happen based on these words