When Quasars were first discovered there were some who thought they were aliens trying to blink messages...until we figured out there were just Quasars.
I agree. Aliens unlikely. Still interesting.
If nothing else, it puts the idea of a Dyson Sphere in the public mind, which is a good thing.
Someday (not soon, of course) we will hopefully be building one of our own.
Or something similar. Rings, as pictured in the article. Or swarms of sun-catching solar-orbit satellites.
Why let all those photons go to waste?