A TV that is not connected to the internet is effectively just a large monitor.
I understand that some TVs lock functionality and coerce you into connecting it to the network, but most of them function well as monitors. I know it’s tempting to make use of the “smart” features since it’s included, but if you care about privacy, it’s better to keep it off the internet.
I just want to say how happy I am that good sounding audio equipment and large screen TVs are relatively cheap. With a bit of research and tinkering, one can have a nice A/V setup for not much $$$. Of note, I am very impressed with the audio quality of Class D amplifiers nowadays. I was conditioned to believe that Class D would always be inferior until I tried it myself.