Your hub isn’t using Wi-Fi at all in that configuration. Even if you had it connected via Wi-Fi instead of ethernet, it would just be another end device as far as all your other Wi-Fi devices are concerned, no different from a tablet or a game console or anything.
As far as your other devices, it depends what protocol they are using, so we would need to know the specific brand and model before we could comment any further. It’s possible that they are all Wi-Fi, but given what you listed, my guess would be that some of them are either Zigbee or Z wave. 
You might want to start by reading the wireless range and repeaters FAQ. Begin with post 11 in that thread, read that, then go up to the top and read the whole thing. It will explain a lot about the different protocols and what’s going on. (The topic title is a clickable link)