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I think E.T. refers to alien. If he means from outside of Earth generally ... well that is tautological. So I assume he means aliens.

Extra terrestrial is a astronomical term of art that means "not of Earth." E.g. not a satellite. His usage was correct, your interpretation was not.

How is it tautological? Signals like that can be terrestrial in nature. In fact, recent story:

Yeah but i dont think he was saying no comet implies no microwave oven. Oh i dont know what the ancestor meant maybe we should ask him or her or it.