It's interesting how similar this design is to a UAV propeller design that was created by MIT Lincoln Laboratory [1]. Not claiming that anything nefarious happened--it's just interesting how people often unknowingly converge on the same design.
(For the record, it looks like the MIT LL patent was filed in 2017 [2]--not sure how that compares with the patents in the article.)
[1]: https://news.mit.edu/2022/lincoln-laboratory-inventions-win-...