The female cord caps are not considered receptacles. See 645.5(B)(2) where the male-female combo are referred to as "listed attachment plugs and cord connectors".
As to ron pointing out busduct as not one of the permitted branch circuit wiring methods under a raised floor, assuming the plugin units contain branch-circuit OCPD, the busduct is a feeder, not a branch circuit.
So, with the busduct being a feeder, and power cords being covered under 645.5(B), you have no branch-circuit supply conductors to receptacles.
This makes no sense (to me).
Plug is the male configuration, receptacle is female. Looking at art 100 definitions, power outlet includes receptacles and outlet is the point on the wiring system where the supply is taken to utilization equipment.
A female twistlock device clearly meets the definitions of receptacle and is part of the power outlet assembly. There is no difference in the definitions I can see going from a twistlok receptacle device to a twistlok female cord cap. They are both receptacles.
2005 NEC: 645.5 (B) applies above the floor, 645.5 (D) applies below the floor and 645.5 (D) 2 is for wiring methods "to receptacles" where cords are not listed for use.
IMO the cord from the busplug to the female twistlok is "branch circuit supply to receptacles or field wired equipment" and not compliant with 645.5 (D) 2.