Because a brown dwarf is a star? https://en.wikipedia.org/wiki/Brown_dwarf
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Where is the rule that says a star can't also be a planet?
As far as I'm concerned, CD-35 2722 B can self identify however they want.
If they want to identify as a planet, however, they can claim the almost unique distinction of having a gas giant as their moon. I wonder if the gas giant itself has their own small rocky and potentially habitable moons.