Couple of points, but not a physicist or scientist.

1. I believe most existing concentrating solar plants operate below 1,000C. 1,500C might be well understood in producing syngas using other energy sources, but operating a CSP at that temperature is not. To the extent that a company is bringing a CSP plant to market with 1000+ temperature operation, that is novel.

2. Heliostat design seems like a core focus of improving CSP performance. A lot of research direction is on lowering the cost and complexity of deploying and maintaining the mirrors. See: https://www.nrel.gov/csp/solar-fields.html and https://www.energy.gov/eere/solar/heliocon