Um, hate to disagree with the article, but NO, Tabby’s star has not been ruled out as possible alien mega-structure.
I hadn’t heard of Tabby until your post. I just read this:
Whatever is blocking the starlight from Tabby’s star is “not surrounding the whole star — it must be along our line of sight,” Wright said. “So you can do that if it’s in a disk of some kind. And that hopefully will help constrain what the heck is going on.”
“Wright has a hunch that the answer lies far away from Tabby’s star, out in the dark depths of space.”
The comet theory, blocking the light near the star wouldn’t make sense, but knowing that the Bible says in Revelation 12 that the sun becomes black, the moon red as blood and the stars of the sky fall to the earth like figs from a tree.
So what if this group of rocks are HEADING TOWARDS US? wouldn’t that account for the loss of light from the star growing each year? I just always wondered why no one has seen them. :) Enjoy!