Every TV is essentially a dumb TV until you connect it to the internet. I bought a cheap TV and only use the remote to turn it on and have it connected via HDMI.
Unless it complains at you to connect it to wifi when you turn it on.
I've seen higher end Samsung TVs do this, or probably most Android TVs I'd assume.
Vizio, so far, is quite nice in this regard, you power it on, it asks you to accept an agreement, you say no, and it says, welp, I guess I'm a dumb TV now.
I intended on using mine that way, but honestly the built in Netflix and USB stick player are decent enough. As long as your receiver does the eARC thing it should all be fine.
It's always the convienent features that kill privacy. Sadly you have to put in more effort if you care about privacy at all
Convenience and privacy are typically mutually exclusive.
Not sure if they are a reality or just a MBA's wet dream yet: TVs with integrated eSIM to not even require WIFI for transmitting usage data and ads.