I use the Superhub 2 for my Computer / Laptop etc using WiFi with no major problems. I recently bought a TP-LINK set up which sends a signal through the house's electric system. However the system needs to be connected to the superhub 2 via a Ethernet Port, but when I tried this the Wi Fi stopped working. It does appear that the hub cannot deal with Wireless and Direct Link at the same time. Am I right?
You are right if you say that happened to you. But in the general case that is not so.
At leadt if I have understood you correctly. You have bought a TP-Link Powerline kit. Perhaps you could tell us the model. If set up correctly, there should be no relationship between Tp-link WiFi and the hub's WiFi.