The summary doesn't mention extra terrestrials. Is this because they don't want to jump to conclusions or is it because the nature of the pulses doesn't appear to be organic?
When astronomers point a telescope at the sky and see a large bright object, they tend to assume it's a star, not a giant alien lighthouse. If they see a bright flash of light, they assume it's due to some natural process and not an alien strobe-light. Is there some reason they would jump to an "it's aliens" conclusion in this case? You do understand that light is light, right? Even if the wavelength puts it in the radio-frequencies instead of the visible-spectrum? There's no particular reason light in one part of the spectrum is more likely to be made by aliens than natural phenomena.