That figure is out of date -- looks like it was 33% last year and climbing. Source: https://www.cleanenergywire.org/factsheets/germanys-energy-c...

All told coal accounted for 37% last year. So if the trends continue (and it seems like they will), then renewables will eclipse coal by around the end of this year.

Build more solar and wind and add more energy storage to get you through the lagging periods and no more coal capacity will need to be added to the grid, nor new coal mines dug.