Construction costs are currently skyrocketing

Occam's razor would consider that unlikely. The Chinese leadership has long claimed how superior they were to the West. Now they can't get out of that situation without losing face and are going through with it, no matter what. In a functioning democracy, politicians are voted out if they hold on to wrong paths for too long. And that's why loopholes are eventually sought to be able to change opinion (requirements from the EU, demands from coalition partners or federal states, ...). In an autocratic system, there is neither the direct pressure of being voted out nor a larger part of the excuses. And that's why all supply chains with Chinese components (so very many) will still be quite tense this year.

I have been regularly checking the prices of our prefabricated house supplier since we built. Each time the identical floor plan, 145 sqm (137 sqm living area) gable roof with 1.30m knee wall on slab foundation, excluding earthworks, painting, flooring: 2015: 225k 2018: 256k 2020: 291k 2021: 305k then increased to 318k during the year 2022: 334k in February and now increased to 352k (current price) From 2020 onwards, additional services such as electric blinds and since 2022 also the controlled residential ventilation system have been included. In addition, the standard was "raised" from Kfw55 to Kfw40. Surely, a few things were changed in the construction service description, but the price increase is quite significant.

Similar to what I know from Danwood. We looked at the Classic 266 there in 2017/2018. Price back then from the base plate turnkey (without upgrades) 286,000. Now 452,900 (however with heat pump + controlled residential ventilation instead of gas in the base). Quite insane!