Not completely. On a Google TV device, "Google TV" is the operating system's home screen and the services behind it, not one app you can remove. You can switch most of it off, though, and you can undo every step.
com.google.android.apps.tv.launcherx. With ADB you can disable it once another launcher is installed. Disable it with no other launcher and the TV has nowhere to go when you press Home.pm disable-user --user 0 turns a package off and pm enable brings it back. pm uninstall --user 0 also exists, but recovering from it takes extra steps, and some guides that use it on core packages (Play Services, keychain) have soft-bricked devices. Disabling gives you the same result with an easy way back.
adb shell pm enable <package>