I want to know the content of the bursts. especially since that frequency set is filled with astronomical phenomenon. Using Earth or Jupiter as an analogy - If you monitor the correct bands, you would get the same thing. All caused by lightning. The other problem is propagation attenuation. we're talking black hole or neutron star strengths at that distance.
Radio astronomy went through this same exercise with spy satellites, pulsars, magnetars and a few others.
Heck, the optical guys are still scratching their heads over Tabby's star and Betelgeuse.
for my 2¢ I think 'they' are out there. The odds say its probable.
But no one has squared the Drake equation with the Fermi paradox yet.