They are saying that storage is not needed in the grid because

a) Households will have storage in the form of batteries b) We will replace the existing grid with a grid that advises devices of he cost of electricity. c) We will replace existing electricity using devices and systems and devices smart enough to turn themselves off when the cost of electiricity gets too high.

So, storage is actually needed and all we need to do is spend massive amounts on updating the grid and replacing devices to make this possible.

It annoys me that there are a lot of hand-waving articles like this but I have a lot of trouble finding solid analysis of the practicality of a renewables based energy system.

I am not convinced it will work at all, let alone at a reasonable cost.