Google TV was a predecessor to Android TV. Source I have one of each in the house, but also the wiki article in the post you replied to. Google TV may have run on top of Android, but it was its own Shell. The OS was still useful until a youtube update killed youtube on it. The TV came with a full keyboard on the remote.
The new Google TV is more akin to iPad OS and iOS splitting, where the TV and Phone variant can have their own identity, but from the looks of it, its starting out as just a single android app, and not a full on shell fork.