Robo-food is things like Automatoes, Currentcorn, Diodias, and things made from them. I was poking around in the code to make a version for my species, and it's under the diets config file as to what the various food groups are. If you want to know what falls under which, I'd recommend nabbing the modfiles from the steam workshop, opening them up, and looking at the produce section of the code.

The foods should tell you if they're herbivore, carnivore or robot food.