Earlier quoted context omitted.
Or, if you want: Not building twice as many (wind/anything) was a major mistake. Nuclear power plants fail sometimes, just like the wind fails. In 2016 almost a third of the plants in France were offline at the same time, some for planned maintenance, some unplanned, and the peak prices were higher than now. All these things are fixable by overbuilding enough. There's nothing special or magic about nuclear.
Building more nuclear helps de-risk wind droughts. This isn’t specific to nuclear; building more of a different kind mitigates the risk.
Wind power makes a lot of sense as long as you are still using fossil fuels. Every watt generated by wind power means that you can reduce fossil fuel, and thus lower your CO2 emissions. But once you got rid of fossil fuels and you have a reliable source of power without CO2 emissions, you can get rid of the unreliable ones.