Amongst other errors, the analysis in the second "science" link is based mainly on the false premise that body parts are only moved by their own muscles. For instance, speed of the arm movement is exclusively credited to the triceps and the forearms. Not true. Stand erect with your arms hanging straight down and relaxed. Rotate your trunk and shoulder fast back and forth flailing your arms and hands past your rotation. Arm speed is faster than trunk speed yet the trunk is the only power source. This is the phenomenon is not fully accounted for in the analysis.

When discussing sources of power, consider the example of a tsunami. What is the SOURCE of the great speed and massive power of a tsunami? Is it the water crashing on the coastline that we see as the damage is being done? No, the SOURCE of the power is the relatively small movement of the ocean floor at the epicenter. The other elements of the system modify and deliver this power, but do not ADD any power. They are however, still essential in unleashing the speed and power from the true source.

The Iron Byron machine has no arm, shoulder, or hand "muscles" but produces great speed with only trunk rotation acting on a series of levers.

I am discounting the importance of the hands and arms, because I believe they do provide power, but real speed is dependent on the proper use of the lever system of the body and the club to deliver significant power from the core, IMO.

Also, there is no such thing as centrifugal force. There is centripetal force which causes a moving mass to deviate from it’s natural tendency to move in a straight line path and to instead move in a circular path about an axis. When this centripetal force is removed the object will not move perpendicularly away from the axis, opposite to the centripetal force. It will instead resume it’s natural straight line path, tangent to the circular path it was previously held on.