1) you can not look at Germany in isolation. You need to take into account the import/export market. Decommissioning nuclear plants at a faster schedule substantially altered that, which affected other countries dependency on fossil fuels.

2) Germany is to their credit aggressively trying to get rid of its fossil fuel dependency, but the decommissioning of nuclear meant they needed to offset a significant shortfall. To the extent that hole was plugged by new clean energy capacity, that meant delaying decommissioning of far more lethal coal plants.

Until fossil fuels is at 0, decommissioning nuclear is bad policy.