So you want to build a house more efficiently
The concepts in the article sound foreign to me - they are, since I live in the EU. In Central European countries, most houses are built to last 80-150+ years. People like to use bricks, aerated concrete or specially treated wood that will last for a very long time. There are other systems too, like walls filled with small clay pellets mixed with concrete. Houses built in such a way are quite expensive, usually €300k or more for a typical family home where I live. That leaves some room for prefab (Fertigteilhaus) to be cheaper, contrary to what OP wrote.There are small model cities you can visit where several dozen prefabbers exhibit their current model homes, and if you stick to their plan, you will usually pay less than building on your own. Those are often built on wood frames, but are still quite sturdy and supposed to last at least 100 years. Others are built with bricks or aerated concrete just like individually built homes. Savings are probably achieved by bulk orders, prefab, and a well coordinated team who has built the exact same house ten times already.