I haven’t seen your particular flavor of the argument that actively genociding your population to reclaim the resources they consume is incentivized, but the basic structure of this argument usually goes by the name of “gradual disempowerment” or similar and has been written about many times.
https://borretti.me/article/no-one-escapes-the-permanent-underclass
https://borretti.me/article/when-the-future-doesnt-need-us
I myself have written a less extreme version of this scenario in my essay Varieties of Doom, describing it as my modal scenario.
I think that on inertia alone if nothing else it seems unlikely that states will actively genocide their own populations to reclaim the resources, but I agree with the basic idea that on the current trajectory the biggest threat looks like states being in a situation where any resources they put into human welfare are resources that don’t go into autonomous weapons and supercomputers, and that this doesn’t require ASI.
Probably the biggest counterweight to something like this is that drones aren’t actually better strategic weapons than nukes, they’re just better on an individual battle basis than guns. So great powers that don’t have as many resources to put into drones can still retaliate with nuclear weapons against aggressors. Between this and the precedent of the Ukraine war, this could itself be a source of X-Risk in that it implies if you don’t want to be in this particular multipolar trap your nation must acquire nuclear weapons.
For context, since I think a lot of readers might wonder why this is on the site, Scott Alexander reviewed this psychiatric book about demons where literal metaphysical demons are considered before the hypothesis “maybe the anaesthesia is causing a brain injury?”:
https://www.astralcodexten.com/p/book-review-the-others-within-us