Here are more detailed papers that I found by way of the Guardian article about this company:

"Carbon emission avoidance and capture by producing in-reactor microbial biomass based food, feed and slow release fertilizer: Potentials and limitations"

https://www.researchgate.net/profile/Ilje_Pikaar/publication...

"Microbial protein: future sustainable food supply route with low environmental footprint"

https://onlinelibrary.wiley.com/doi/pdf/10.1111/1751-7915.12...

"Autotrophic nitrogen assimilation and carbon capture for microbial protein production by a novel enrichment of hydrogen-oxidizing bacteria"

https://www.powertoprotein.eu/wp-content/uploads/pagination_...

I want this to be real, but this rings all the bells for yet another EU funded vaporware project, like the Semantic Web.

I hope I'm completely wrong.