Is Betelgeuse Actually a Binary Star?

A Binary Star Found Surprisingly Close to the Milky Way's Supermassive Black Hole

Why doesn't CMB heat up Boomerang Nebula ? I was listening to this documentary and learned that Boomerang is cooler than CMB. How could that be? Is it constantly being cooled by escaping gas from its binary star that keeps temperature lower than CMB or is there something else at play here?

Readers react to Betelgeuse’s buddy, the 2024 Nobels and small nuclear reactor waste