Sounds like a last-minute panic.
But especially with wood, highly toxic impregnating agents were used in the 70s. Formaldehyde in the chipboards and poisons in the wood paints. The house is 50 years old, costs as much as a new build with renovation, but is still essentially an old house at its core.
The real estate market will collapse in the wake of the imminent liquidity crisis due to high interest rates and a lack of new borrowers. Baden-Württemberg is of course very difficult for single-family houses because of the green ideology. They are no longer desired.
In the final phase of a real estate boom, of course, every junk is still bought expensively. You don’t have to be the last stupid buyer.
And you should also consider how much money you are putting in. For that I buy a multi-family house with 10 apartments and never have to work again, while you will be a slave to your bank for the next 30 years.
How low real estate prices can fall we saw 15 years ago in East Germany. They tended toward zero because nobody could finance it and demand collapsed. And there even the location was almost irrelevant.
In Leipzig, they were giving away multi-family houses right in the city! I myself was present in Halle at a multi-family house completely renovated by the federal government. The house was fully renovated for 300,000 euros, had 6 apartments, and was bought for 22,000 euros.
Just as a warning example of what can happen. Always be patient and wait for the right moment.