[kayaeb]

Some people claim to have ruled out type III civilizations [1], which I think is what you're referring to.

I thought also that some researchers claimed a star had signals consistent with a type II [2].

[1] https://en.wikipedia.org/wiki/Kardashev_scale

[2] https://www.space.com/30832-kepler-telescope-alien-megastruc...

[dvdkhlng]

According to recent news, the alien megastructure proposed in [2] may just be a shredded moon [3].

[3] http://www.astronomy.com/news/2019/09/evaporating-exomoon-co...

[stinky]

That's no moon...

[dogma1138]

No one seriously thought Tabby’s Star was aliens it was just weird.