in any unit system, force is the deriviative w.r.t. time of momentum.  in any unit system, the unit of force is always the unit momentum divided by the unit of time. that's where the definition belongs.  this other stuff you added may or may not be accurate (you need to cite verifiable links and define other terms in the article otherwise it original research) but the definition of the Planck force is no different than the definition of the unit force in any other system of units.