The fertility rate trends are missing the core point here. Your obesity and hunger examples actually reinforce the Jevons paradox - when a resource becomes cheap enough, we find ways to use it even beyond what seems rational. But more importantly, you're still not getting the original Malthusian comparison: Malthus wasn't predicting that cheaper food would make people eat more (obesity) - he was predicting that cheaper food would lead to more total people. Similarly, cheaper AI won't just make individual AIs consume more - it means AI will be deployed everywhere possible. The parallel is about multiplication of instances, not increased individual consumption.