Calling it "disruptive" is only to mask that it really isn't such a major development. If it is so much better than current free co-axial turbines, then why wait so long to bring it to market?
I don't hear anyone discussing reliability. How does that stack up against current designs? I'm guessing it is higher maintenance, as you have critical parts that are presumably highly loaded and running together at a contact point.
* more fuel efficient - yes?
* quieter - yes?
* as or more reliable - yes?
Why the need to wait? I sugges there could be longer term issues with this design.