The output of your device is owned and operated by an advertising company; you need an ad-blocker for your ears and/or mind.

What's needed is an array of microphones on these devices, so they can reject anything (using triangulation) coming from the TV.

Or just change the default wake up command.

Or from any human standing in front of the TV.

A better system would be for advertisers or shows to embed an ultrasonic signal in their shows which say the magic words, which google home/alexa watch out for. Of course, that would only prevent unintentional triggerings, so it wouldn't help in the circumstance where the tv show/advertiser actively wants to annoy you.

Then you're depending on the cheap 2w speaker built into the TV to reliably and accurately produce a 20 KHz signal.

or voice registration and recognition, like siri.