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The sleeve is too small to do much shielding for most RF noise.

A grounded metal sleeve the same dimensions would be a shield for radio noise up through the microwave bands. A floating object just causes the fields to be deflected, and if the wavelength is much longer than the longest dimension of the object, the changes in field shape are minimal.

Where this device is useful is in dissipating RF energy rather than reflecting or deflecting it. Most power cords support standing electrical waves. Since they are made from low-loss materials (good conductors and good insulators), their resonant 'Q' is quite high and a little external RF noise energy that covers the resonant frequency of the cord will excite a strong tone on the cord.

This is similar in concept to an organ pipe. The input energy is the turbulent motion of air across a sharp edge at one end of the pipe. The pipe tone is quite loud compared to the actual sound of the turbulent air because of resonance in the pipe.

The sleeve here contains carbon fibers, which act as resistors to dissipate energy from the electric field component of the standing RF waves. This lowers the 'Q' of the cord and reduces the strength of the resonant tone. It does not block all background RF noise from the system, but that noise is a much smaller problem than the resonance.

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