It’s possible a smart TV will use its wifi to connect to another device of the same brand on its own. I’d read an article about it a couple years ago.
If I’m reading about it, that means a company has been working on it, and frankly it makes sense. If I were in their shoes I’d look into making it happen. It’s pretty trivial to do when you think about it.
Not that I think it’s happening in the wild, just an idea to keep in mind.
Also, those devices are always capturing data. So if/when they ever connect, that data will get uploaded.
Sacrilege making popcorn in a microwave