tl;dr - This article is from Feb 2017 and is about TRAPPIST-1
No reason to put "alien" in the headline expect to make it more click-baity.
Honestly, I wish there was an extension that could translate click bait phrases to non-click bait ones. It'd be hard to do w/o first reading the article though.
"Alien" actually doesn't refer to little green/gray humanoids from the movies...by the very definition the plants are "alien," since they differ from Earth and are unknown (or foreign) to us.