"Hey, peasants, have you ever thought of spinning wool into thread so you can make cloth?"  "How do you think we've made our clothes since forever?"
It's not just a mistake.  It's this whole technocratic approach, where of course some dude who's read a book knows so much more about farming than farmers; why would they know anything about it?  It's an attitude that screws things up to this day, eg "Here, have these genetically modified seeds, they'll have higher yields.  They require lots of water you don't have so you'll have to irrigate and dry up the river, and lots of pesticides and chemical fertilizers you'll have to buy from us, which will kill all the bees so your other crops won't get pollinated.  The runoff will poison the water you drink.  You'll go broke paying for the seeds, pesticides and fertilizers.  Trust us, we know what's good for you!"