In the second place, we cannot say that the Earth is not inhabited. There have been millions of years when humans have been on the Earth. If aliens visited the Earth and made the statement that they did not see any life, we would be inclined to call that statement dishonest and deceptive because no intelligent life could exist without the help of humans. And similarly, if aliens said that there were no human inhabitants on the planet, then we might reasonably call that statement erroneous because people do live on the planet Earth.