Do you have anything you can cite for that proposition? I fully acknowledge that there could be something I’m missing, but just thinking about it logically it doesn’t make sense.
It takes X agriculture and Y livestock to feed a person for a year. Economy of scale would allow you to produce more with less in a larger centralized facility compared to many smaller farms. The implements required to support a large facility should be less than the sum of many smaller facilities that produce an equal output. The agriculture and livestock are brought to a central point (the city) as opposed to many decentralized towns.
Happy to be wrong, would just need to see the evidence, because right now my intuition is saying no. Love to see whatever you have!