That's just Q3 2021 compared to Q3 2020.

https://energypost.eu/germany-2021-coal-generation-is-rising...

The money quote:

Similarly, by the end of June 2021, generation from coal-fired power plants was 39 percent higher than in the first six months of 2020. However, generation from coal-fired power in the first half of 2021 was still below the levels seen in 2019.

This is a short-term development over a couple of months. You will always have ups and downs of all sources of energy and if you look into a short amount of time you can find any energy source growing or declining to support your argument. But the relevant question is what development is happening in the long run.

The third graph here gives you a good idea of the longterm developments of electricity generation in Germany: https://www.cleanenergywire.org/factsheets/germanys-energy-c...

What I'm seeing in those graphs is the same. Coal use rising from 2019 to now.

Nice source. What I dont understand is: How did nuclear power grow so much last year—and how was there so little growth in renewables?