At the risk of going full Sweeny Todd with Occam's Razor, what if it's as simple as enriching himself and his cohort via market manipulation?
What if the goal is to deepen income inequality? Opening up low income jobs by deportation. Impoverishing households whose primary savings were in stocks, not business ownership or real estate. Hurting consumers, especially those whose disposable income is lower.
Every lower middle class person, can "command" about 100 other 1/100ths of a person to supplant their life with food, fuel, vehicle, staples, etc. But billionaires have the labor of 1000s or more people at their fingertips. It doesnt matter if the 1000 are destitute, undernourished, sick, weak, dumb, or unhappy, as long as they're subservient enough to maintain or increase class division.