What's weird is that Proxima is way far south, far from where you expect to find any geosynchronous satellites (I think?) Any LEO satellites would not persist in the beam. It's also way south of the ecliptic, ruling out most interplanetary probes.
The positive drift rate actually to me argues in *favor* of it being extrasolar technology, because that implies it is significantly accelerating with respect to the barycentric frame.
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