Earlier quoted context omitted.
My plan to buy a TV is to get one that can be kept offline, or one that can be made able to stay offline through flashing or dismantling into its very core elements. Dismantling it would probably ensure it's ugly af, but maybe if you try to go for one of those TV-in-a-frame things it might not look hideous.
Not sure how common it is now, but based on repair manuals my TV's wifi is provided by a standard m.2 wifi module and can be trivially removed. That wouldn't stop them from changing the TV's OS to nag or otherwise disable itself afterwards but the hardware change is about as trivial as it could be. Now why the disable wifi option isn't available on the TV when it appears in the user manual is another matter...
Or just do egress filtering[0] on your router and block the device from communicating with the Internet. No disassembly required.
I block all access to/from my "smart" TV at my firewall/router and it works just fine.