Insulation of the ground slab in the basement with thermal stone

Just as standard as on the base slab. It's like saying today that electric cars are standard. Or petrol cars. Or diesel.

I really thought it was "outdated." Thank you very much for the clarification.

By the way, a basement apartment will be included in a controlled residential ventilation system as today's "standard" – this also addresses the risk of mold.

Yes, controlled residential ventilation is also present. Your explanation really makes sense. That's exactly why I wanted to inform myself again in an independent forum.