That is frankly a deeply stupid sensationalist assumption of "structural unemployeement? straight to genocide!" The main origins I can find for it are outright projection from The Party's leadership who treated their people as tools and property who existed only for them. It showed in many ways from their military doctrines to lack of investment in even their intellectual workers like doctors. Lumpenproletariant were treated far worse than even homeless vagrants in the most callous of capitalists. Not even late Rome with its later high levels of unemployment and unrest was so cruelly stupid. They knew panem et circenses was the cheaper option in spite of the expense and the whinging of patricians about politicians appealing to the masses with quality of life issues. If the marginal cost of goods goes to nill guess what becomes cheaper than dedicated genocide bots which will lead to retaliation? Building more and using the excess to support them. Let alone what sorts of tasks become possible with a large excess, and the nature of veblem goods.