This is a misrepresentation of Berry's thought. Like many traditional Amish or Mennonite communities, he wasn't at all adverse to mechanized agriculture, he simply believed that technology be used considerately, and that people seeing agriculture up close made for a rooting in local community that he believed beneficial. Even Berry's critics (and he had his share, me included) did not dismiss his ideas so readily as your post.
I grew up in rural Texas, descended from sharecroppers. He's romanticizing a kind of farming that hasn't existed in the US in 70+ years, one that would make it impossible to feed the country.