Indeed, modern developed countries have no more than 2% of their population as farmers. Even if the farming job is supposed to cover everyone who works with food (including logistics, retail and preparation), each farmer job should be supplying more like 15-20 food, not 6. And that's before we start adding sci-fi farming tech.
It would probably make more sense to just drop food as a resource - assume that the food people need to eat is coming out of consumer goods, and that mining includes all primary industries, including farming.
was going to post something but you pretty much summed it up already. imo they could have cut food as a resource altogether