It looks like you are essentially correct. The older RGB LEDs can be directly controlled, but it is only through a 2-wire power feed through the relay, there is no separate data feed. The wired controller must somehow send a data signal over the power wires and the LED unit itself is able to interpret this signal. This means there is no way to control this directly through the AquaLogic/ProLogic interface. It also appears that there are newer “networked” RGB lights that can be directly controlled through Hayward OmniLogic controllers. Of course that is not relevant to this library since OmniLogic has a different component.
Manual for the wired colorlogic controller: