Haha, that's actually really funny: A user named "science-is truth", disregarding all empirical evidence from multiple users. I read theoretical assumptions and an inappropriate analogy in the above text, all while without adding any new, real data. So useless!
TVs are not PCs...Also phones are not PCs. Does that mean neither phones or TVs do not function as a combination of CPU and GPU and maybe other systems on a chip that need an OS (WebOS? Android? IOS ?) to connect everything up through driver support? Are you aware that many devices actually have built in drivers these days, so no separate software driver need to be installed?
In any case, and contrary to before, I get rates of around 170 mbit/s and completely smooth playback of all bitrate movies through the Cable Matters adapter. All this while wifi and built in ethernet are completely disconnected. So the adapter is definitely working, and also definitely exceeding the built in ethernet limits.