I might be missing something here, but I did not see the TV automatically recording stuff by itself (or them showing it is transmitted somewhere) without a visible UI element showing that the microphone is active.

It seems that they turned the TV into a wiretap via root. That is a concern and might give some lessons for LG that they need to invest more into security of their devices (privacy indicators, attested boot, anti-root / anti-persistence measures, hard-shutting off the microphone without privacy indicators)...

But you can pull of similar attacks with a compromised laptop / computer or smartphone.

Of course, it's a TV, why does it need that stuff? Still though, I think the video itself is a bit misleading that it claims (or many people think) it automatically records and transmits all this stuff, while this was not shown here (unless I miss something).

Totally and absolutely, and seemingly proud of it. Just gross.