Were I an enterprising enshittificator, I would certainly make sure to force being online as a prerequisite for basic functionality for any TV that has ever been seen online since that proves that it's capable of connecting. So.. be careful upgrading the shitware, you might get more functionality that you've bargained for. Functionality that you can't downgrade because you don't own the TV.

Some TCL TVs will refuse to work if you don't connect them to the Internet. I'd never buy one in the first place, and if I did, I'd return it immediately as defective. Eventually retailers will get the message and stop carrying the despicable brand.