Something Is Sending Earth 13,000 Year Old Star-Maps?

In the January of 1974, a man by the name of Duncan Lunan, published an article called 'Space Probe from Epsilon Boötis?',
It concerned a mystery surrounding long-delayed radio 'echoes’ or LDEs, first reported in the 1920s.
Mysterious 'echoes' of the transmitters voice, which were far too powerful to have been simple reflections from Earth…
Experimenters studying all over the world, found that their outgoing pulses were being returned to them with a delay of three seconds, as if they were being amplified and returned by something at the distance of the Moon, but definitely not the Moon itself…
These delay times began to vary upwards from three seconds, in increasingly complicated sequences, but with no variation in intensity, still indicating a single source amplifying and returning the pulses.
Prof. Ron Bracewell of Stanford, suggested in 1960 that the 'echoes' might have been re-broadcast by an unmanned probe, from another civilisation.
A craft attempting to get our attention, and in 1972 Duncan would make an incredible discovery, successfully making a translation of the echo patterns.
The variations of delay times appeared random, but Prof. Bracewell himself had suggested that if indeed a probe, the first signal might be a star map.
After plotting the delay times in chronological order, he found what indeed looked just like a star map, upon showing this to astronomers it was recognised to have been a warped image of
Epsilon Boötis, in the constellation Boötes.
Interestingly, Arcturus, the brightest star in the constellation, seemed to be out of place in the map; but on checking, was shown at its plotted location within the map about 13,000 years ago.
Predictably, the discoveries were treated as suspect, and with great hostility by the academic community.
Sadly this pressure led to Duncan withdrawing his entire translation work and research.
Did Duncan Lunan actually decipher the first message ever translated from an alien civilisation?
More research into this incredible echo anomaly is clearly needed, and the results of which released to the world.