I think I got it... after reading Yonex's website in several languages.. you know how it is, sometimes Japanese term are used in a weird way..

Anyway, Hold meaning how long the shuttlecock will maintain in contact with the string surface.. Repulsion means the opposite, where shuttle-cock spends minimal time on the string surface.

By looking at the chart and a bit of physics of deflection... Hold rackets should have a more bouncy frame, lower natural frequency. Where Repulsion rackets are more "twinge" and vibrates more.

Imagine a ball bouncing off a hard surface -concrete - compared to surface that stores energy - trampoline.

(of course the string will come into the equation as well..)

Hold rackets should in theory be better for slice and big power hits, ie mid court to back court, but requires more initial energy. Repulsion rackets have a firmer frame, thus need less energy.

That's my understanding anyway. And I think it comes down to personal preference of how the racket feels. (Because still need to factor in string tension and string type..)