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...