The nuclear emissions seem to be optimistic in their absolute amounts - mining and producing nuclear fuel causes a lot of emissions. No one claimed it exceeds the one of fossil fuel power plants.

There has been a strong decline in coal usage in the last years, both because the CO2 prices have started to move the balance and also because the buildup of renewables has been accelerated again. And no, France hasn't been "filling the gap". Until very recently, Germany had been a constant net electricity exporter.