At least they found a solution for barbecue, even at night, instead of coal or gas :
Solar Stove Uses Salt to Stay Hot after Dark - BORGEN
But area for capturing the sun (looks the circle fresnel on the top), could be larger, to get more storage and more hour of use alfter sun goes out.
Would a similar idea works for home storage of electricity, being cheaper than bateries ?
Sure it would require a small turvine, to use the heat of sault to produce steam.