When we were looking for an upgrade to our TV, I specifically wanted a “dumb display.” No internet connection, no built in streaming services, just a display that would connect to a computer and show me the stuff my browser was playing from my Jellyfin server. If you want that kind of device, it seems that “Digital Signage” or “Commercial Display” is the category under which you are wanting to look.

They do often have network ports as they’re designed to be centrally managed (think hotel TV) but there’s zero requirement to give it a connection and it works beautifully without one.

Anyway there you go, hope that helps someone.