I can't translate all of that, but I get the idea. I am aware that if your car is not tuned for 93+ or even 91 you are simply throwing money away.
But for high performance cars that are tuned for it, or when custom tuning your car the higher the octane the better. For high performance cars like say a Mercedes C63 AMG, BMW M4 and even more mainstream cars like a Subaru STi, Chevrolet Camaro or Ford Mustang there are significant benefits running the car on higher octane fuels. Usually in the form of ECU's running more advanced timing giving slightly more horsepower and the possibility of better fuel economy.
But lets not kid ourselves here, no one really cares about fuel economy. It is more about more horsepower and of course safety at the limit, preventing detonation or pinging.
Also when it comes to custom tunes, if you upgrade your intercooler, exhaust, intake and get a flash tune or add headers in a NA vehicle with a tune you are going to make more power, more safely running 93+ octane than you will with 91 octane.
In fact coming back to that little cartoon you posted, 91 is the worst of all worlds. It is significantly more expensive than regular 87, but doesn't offer the resistance to detonation that 93+ would offer.