The move away from nuclear and the move towards gas are more-or-less unconnected. After the (currently in place) decision to shut of nuclear from 2011, the gas

The move away from nuclear and the move towards gas are more-or-less unconnected. After the (currently in place) decision to shut of nuclear from 2011, the gas part of the electricity first dipped a bit, then went a bit above 2010 levels after 2019. But it's not like our dependency on gas for electricity was radically different before the decision to exit nuclear (at least the current one) and right now. If you prioritized getting away from fossil fuels, instead of nuclear, the current situations might look differently but I don't think that would've been politically feasible. If nuclear were just left running and providing 22% of german electricity, I don't think we'd be in a much better situation right now. The major issue isn't electricity, but other forms of energy usage like heating. But that wasn't ever something done with electricity (at least on a large scale) in germany, even in the nuclear heyday (as opposed to france).