I thought it was an April fool's joke too that was posted a few days too early.
Awesome work, it's super cool to see people trying new and innovative things like this. I am interested in seeing how well they work. I'm also interested in how well they stay together in larger sizes...some of the normal carbon fiber propellers have been delaminating, and I'm sure the stresses are much higher on these.
My only other concern is the size. Although many people are still flying 50's, there are more and more 55's and 60's out there. If it's turning 7500 on a 50, it might not be quite enough prop for a 60 or a 55.
Have you thought at all about making some smaller ones for electric?
Again, congratulations, very cool stuff!