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My impression is that he doesn't mean 'aliens' as we use it. The above reading of the article seems a little sensational. The search for intelligence in the heavens he seems to be talking about is something more like an effort to communicate with the heavenly bodies themselves as intelligences, or to address greater beings or spirits who might have been seen as using the stars and other lights of the night as glyphs, that sort of thing. An effort to create a structure great enough to arrest the attention of whatever is out there.
Something is not right. This message is just to keep things from messing up down the road