They might have but I can't see it. It looks like they are splitting water to make H2. Quick search showed that there is a company in Spain that had done so since 2008.
You're referring to Hydrosol, an EU-funded prototype thermochemical solar reactor which produces hydrogen by splitting water (and using some of that resultant hydrogen as fuel to scale up the process to industrial temperatures).
That is not at all what Heliogen does. Both products are similar in the sense that they use concentrated energy, but Heliogen has more in common with concentrated solar power plants (like the one between LA and Vegas) than it does with Hydrosol.
https://edition.cnn.com/2019/11/19/business/heliogen-solar-e...