I don’t know, but if good smart TVs are cheaper than good dumb ones, you might consider ignoring/disabling the smart bits. I might go so far as to sever the Wi-Fi/Bluetooth antennas.
Tom’s Guide: Dumb TVs — here’s why you can’t find them anymore
That’s because, for a number of reasons, it’s cheaper and more profitable for TV makers to simply include a smart platform with every TV they ship out. It’s actually a major reason why TVs have become so much cheaper in the last decade — with a smart platform, TV makers can sell the hardware at cost or even take a small loss, but in the end make money through the advertising that shows up on the homescreen.