Specifically, https://en.wikipedia.org/wiki/File:Energiemix_Deutschland.sv... shows 1990–2020. There _is_ a slight uptick of fossil fuels in the immediate short-term of the 2011 phase-out plan, but it's they're now below the levels they were at then.

But, as others have said, if they'd maintained the level of nuclear generation the CO2 emitting fossil fuel plants could've been shut down instead.