Their numbers seem off, though their mix of units means I cannot be bothered to do an accurate calculation. Metric for science please, or go home.

However at least one claim is certified BS: 10 KWh (if that is what they mean by KW/h), 24 hours a day. The incident energy on a 9 m^2 surface, aimed at the Sun, is indeed 10KW. However that is under best possible conditions, meaning Sun at zenith, clean air and no clouds. From the 10KW figure you need to consider mirror inefficiency, solar collector inefficiency, and steam engine plus electric dynamo conversion losses. Then there are thermal losses in the molten salt heat storage battery.
Not to mention the fact that the Earth tend to rotate once a day. So without an atmosphere you'd maximally receive 5KW continuously, when averaged over a 24 hour period. Subtract all the combined loss factors, including the imperfect atmospheric transmission during the day as the Earth rotates, and you will have an idea why something like this hasn't been realized ages ago.
The basic idea is sound, and large solar collectors similar to this one has been built and operated. But they tend to be huge, to make up for the various losses in the system.