I could not glean from the arxiv paper how far away these anomalous stars were from Earth. Assuming c is a hard limit, the ETI would have to be roughly 50 LY a

I could not glean from the arxiv paper how far away these anomalous stars were from Earth. Assuming c is a hard limit, the ETI would have to be roughly 50 LY away to catch our first signals and send a beacon signal. If instead they observed Earth as a possible life-bearing planet, which could have been made thousands or millions of years ago, then disregard above paragraph. Or maybe they are just generating signals in more than one direction. Or maybe our interpretation of the anomalies needs adjustment.