You are comparing apples to oranges in my mind. Bike motors are built for performance and high rpms, outboards especially smaller ones, are built more for consistency and reliability and red line at lower rpms. I wouldn't doubt 0w20 in a bike would pick up some performance because of the tight tolerance the motors are already built to.
I'm not sitting through the whole video, but it seemed like they just checked if it would work. To me that means nothing unless they show virtually no damage after the bike has another 10k miles/one year wear on it. Even so, none of my bikes ever made it past 30k miles without needing motor work.
My wife's last 3 cars were speced at 0w20 synthetic, and they warn deviation could effect fuel milage. It's becoming pretty common, but these are light duty vehicles.