What follows bellow was taken from the February 4, 2021 press release.  The part that is Bold, Italic and underscored explains that Apollon is not using nano-silicon in their packets.  link to press release

The Trekhy page on HPQ's website is still active as you can see here, so I'm guessing the JV with Apollon is still alive.

The production of renewable and green hydrogen with silicon Over the last few years, Apollon Solar has developed expertise in the production of hydrogen by hydrolysis by creating a reaction in water "H2O" with porous silicon nanopowders to release large quantities of hydrogen " H2".

Armed with this expertise, Apollon has developed an autonomous system with a simple operation: Hydrogen is generated by hydrolysis, thanks to the use of a chemical powder that, by reacting with water, releases hydrogen, which is then transformed into electricity by means of a fuel cell. In the end, this makes it possible to charge batteries, among other things.

The use of porous silicon nanopowders doubles the amount of hydrogen released by the system. However, the high cost of manufacturing porous silicon nanopowders means that Apollon has chosen to use a less efficient, but more economical, environmentally friendly chemical powder to begin the commercialization of its systems.

HPQ and Apollon will compare the technical and commercial potential of nanoscale silicon materials and porous silicon materials to create new generations of green powders with better performance for hydrogen production.