This is a known feature that is not hidden which is not automatically turned on by default.
You must set your TV to a different standby mode and enable LG voice control.
When you do this, it very plainly tells you that it can listen with the screen off so you can control the TV with voice.
And you believe that? Don't simp for billion-dollar companies, they don't need your help.
It's time to call it what it is. Spying.