You are a fool to be upset about this because of this definition you decided on.

Every novel I've ever seen written about being on another planet has used the term sun or suns to refer to the stars in those stories.

Every movie has referenced the sun as the star that gives to term sunny day.

Many shows I have seen have had alien characters reference the sun of their home worlds as their suns.

It's easy to accept that the term sun, as used by human beings for the last 100 ish years, uses the term sun to refer to many different stars that aren't in the Sol System.

It absolutely makes sense for exactly the same reason Chris Cornell wrote the song. He imagined what a black hole sun would even be, which is pretty fucking fantastic to find an object that was given a name before it was even conceived of as a concept.

And you cant see the awesomeness of that happening? You must be mad at every science fiction, fantasy story that's ever existed. It's just as rediculous as you being mad at this