It's not the Android TV Launcher per se. If you revert that app to the factory-installed one, the "recommendations" banner will still show up within an old vers

It's not the Android TV Launcher per se. If you revert that app to the factory-installed one, the "recommendations" banner will still show up within an old version of the launcher. So this comes from Play Services. It appears the launcher has an exclusive hook for Play Services to show content in, and is being used for this purpose. I am still reverted to the original Android TV Launcher because it takes less clicks to reach some functionality and is simpler, but the recommendation banner ruins it somewhat.