DJI happens to be a Chinese company but Samsung isn't, and they have been tracking what people watch on their TV (even if you're using HDMI and your own input) for years.
Big European, Asian and American brands are doing the same, washing machines requiring an account to access basic capabilities, cars phoning home, computers phoning home, phones phoning home, they all want it, they all do it.
Blaming China for this is deflecting the true culprit: the rampant notion that everything that could be sold has to be sold. Privacy doesn't matter, just put a red ribbon over it and force user to create an account and share their data in exchange for the priviledge of accessing what they thought they bought.
China didn't invent that, they sure love it, but they are not responsible for it alone.
How? If you didn't give it an internet connection, how is it sending any tracking data back to the mothership? It can't guess your wifi password or anything.
My xiaomi TV is making thousands of request per day to their domains. I block them all using adguard/adblock, but imagine the amount of information they can get from a connected TV.
Samsung and LG and many others do this. Look for Automatic Content Recognition (ACR) in Samsung's privacy
This interesting study from last year: A First Look at Automatic Content Recognition Tracking in Smart TVs - https://arxiv.org/abs/2409.06203