This is not the reason here, capacity would have been available in greater amounts.
Quote from an analyst report:
"Despite the very difficult market environment with significantly lower volumes and considerable wage inflation, profitability was able to be increased. Operating margins rose significantly, operating cash flow and earnings per share increased in local currencies. This strong performance was mainly enabled by the high operational flexibility, especially in the plants and logistics, the significantly lower energy prices and consistent price management."
Emphasis by me.
In plain English, manufacturing costs have decreased thanks to declining raw material and especially energy prices, but sales prices were not adjusted downward; consumers still have too much money anyway and buy it regardless.
Edit: with a bit of bad luck, we are now actually running into a wage/price spiral, and then things will get really interesting.