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It isn't. Even discounting day 1 patches, every console assumes an internet connection. You're at the mercy of the game devs, and unless you are checking for "internet connection required" (and believing the lack of such on the box means you really don't need one), you can still end up with something that will refuse to boot unless it phones home.

> every console

Except the Switch.

Well, they're all -functional- without one. They also all have games that are only sold digitally, check in the background for patches for both the system and the games, and may refuse to start if you're running a version of the OS that is older than what is known to exist at the time of printing a physical copy. The Switch is no different there.

I think most console games will run without any issues even if you pop in the disc to the console without any kind of Internet access.

There's a Twitter account that documents if games work without having access to the console's network/stores: https://twitter.com/DoesItPlay1/status/1474819155173908484

For PlayStation it is, but I think it is the only one. The console can operate 100% offline.