They're called Brown Dwarfs. We've known about them for a long time.
The observation isn't about discovering brown dwarfs, but rather it contributes to defining the boundaries between what is classified as a brown dwarf and what is considered a gas giant. Additionally, it was one of the first instances where a brown dwarf was observed with satellites, making it noteworthy.
It's called reading the article. Other people have been able to do it for a long time.
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