This guy can make like 10 models (10 different houses) for a housing broker within a few hours. He is really not willing to talk about it and the the cost for there "renders" are that low that it is not likely to be hard to make these images.
For example he asks for four renders per level plan 150 euro's. When i look at all the professional render companies i only come across costs from 800 euro's per image. So how could it be possible that he makes these images that cheap. I myself am also rendering a lot nowadays but it always cost time to render.
So i hope you can understand my doubts. For me it really feels like an automated program like you draw the walls and you insert some standard models and this is the result. Otherwise you can't work this cheap and this fast. Right?