Well Warhorse are czechs, so yeah, they know what theyr doing.
Some points to adress - If you talking about shape of the fields and types of the buildings (for example) it looks exactly as in some older czech villages. Exactly spot on !
For the fields - All of czech republic and slovakia is rocky as hell. There isnt much flat space here now, and there wasnt basically any then. So you see fields go up and down the hill constantly. And in most areas there simply isnt nothing else but forrest, rocks, bad soil where you cant grow anything. And as a result of that you will see them in various shapes and sizes (where you have nowhere to grow, you arent picky). And there are other as well, like rain rain. Hell its rainy here. It rains constantly. And because the water runnig down the hill damaging your crops and flooding your seeds , taking them away. You simply cant have wast fields without any protection from that. You rather make some blocade against the water (plant trees, dig a canals and trenches) on a smaller scale.
The fields you saw in the trailers arent the typicall fields which fed the nobles, and the whole nation( as it was the farmers duty). Those were much larger, but rather the personall fields of the farmers that worked them in their free time (so they could eat or sell them). Or they had a cows, sheeps, pigs, chickens in those areas, (those with the mudd). It was just a private area of the family, or the village a secondary income if you will.