I have a feeling that the creators might be wrongly assuming that we could evolve plants to thrive in extreme monocultures (no other plant or animal life). I suspect these efforts will be met with diminishing returns of a) seeing lower yields because plants don't need to compete for resources b) really hard to go beyond 99% of desired plant because of energy consumption c) weeds adapting to fool the AI and resemble desired plants in phenotype and d) people who tread on the soil to weed by hand interact with the soil in a different way than a robot on wheels.