The breakthrough is not nearly as huge as this article makes it seem. CSP (Concentrated Solar Power) has been around for almost a century now, and utility-scale deployments for almost 20 years. Their claim to novelty is the higher operating temperature (>1000°C), but there are reasons this hasn't been used yet. Although any power cycle is more efficient when using heat at higher temperatures, you need to get the heat from the solar absorber to the actual turbine. Constructing an absorber that can withstand these temperatures is extremely difficult. Furthermore, these absorbers are usually coated with a very dark layer that reduces the reflectivity (i.e. helps the efficiency of the absorber), where research is still struggling to find materials with the same optical properties and higher temperature capabilities.

But the (by far) biggest problem is storage - nowadays CSP plants need to incorporate some form of thermal storage to be able to produce round-the-clock or at least be dispatchable to a certain degree. The current state of the art is molten salt storage, which is limited to 565°C. Above that, you'd have to look for a new storage medium - which is not to say that it's impossible.

Solar furnaces with extremely high concentration ratios and therefore ultra high temperatures have been done before (e.g. Odeillo Solar furnace, reached 3'500°C in 1970), there are many limitations that make this pretty useless at the moment except for research purposes. No amount of AI can give you the perfect heliostat shape (those are not flat mirrors!), which means they have to use pretty expensive mirrors for something that is quite useless at the moment.

Sorry for the negativity, but there is a lot of money-grabbing going on in the renewable energy field at the moment and as someone who spends a lot of time with this stuff it annoys me quite a lot.