No its not...he tested it to how he wanted to...NOT to how the props are designed to be run
His testing was done as if you have a IFA or constant speed. These props are ground ajustable and designed to run a max rpm on a gearbox driven engine
If you set them up as per factory instructions you will get a substantial improvement in performance...more than 50 customers I have sent props to with maybe 15 or more different style of aircraft cant all be idiots..they know what performs better than what they had. I have not had one customer that did not get substantial performance increase