There is no direct link between this and the smart bulb. From the question, sounds like you're trying to find out if the plug will work as a hub for the smart bulb, which it won't. The plug connects directly via WiFi and does not need a hub nor will it work as a hub for the Ikea smart bulb. You can still switch on and off the bulb with this plug, if the bulb is connected to this plug, however, in that case, there is no point in the bulb being a smart one.
The gateway for Tradfri controls the dimmable features, colours and on, off etc. If you just want on and off function for a lamp it might work with the bulb just test it first by turning it on and off at the power point first before you buy.