That’s not the point (disclaimer: I love nuclear power), the point is this let’s them Supplement rapid energy demand /spikes/ over the span of literally seconds vs ramping up generation from other sources which are all slower as well as generally being further from where it needs to be at that moment. This allows them to readily absorb spikes happening randomly around the grid in an easier manner
Agreed! Inverter based resources have the ability to respond within a few milliseconds whereas the next fastest response would be from hydro power and that could take as little as 10s. More conventional generation takes a lot longer. [1] has some nice charts showing cold-start times for different types of generation.