How its made: Notice the reference to additive manufacturing. That is a euphemism for 3D printing.
The Dutch 3D printed a tug propeller a couple of years ago, and announced it early last year. https://www.theengineer.co.uk/worlds...ine-propeller/
It seems to be a prototype that no one is adopting as a manufacturing method...searches on google for 3d printed or additive manufacturing propellers only reveal the above prototype. They have a video on youtube - its a pretty cool process, basically a wire feed welder married to a 3d robot arm equipped with an aluminum-bronze alloy wire. (I didn't know there was such a wire, does anyone weld props with a wire feed?)
Agreed - it appears the website is for investor attraction. It will be interesting to see what comes of the props in 5-10 years