The thing is, dark energy is only dark because it doesn't interact electromagnetically, whereas black holes are dark because the light gets trapped. So these are very different concepts.
I think it's fair to say black holes are a kind of "star", but the concept of dark energy and dark matter are something else.
> dark energy is only dark because it doesn't interact electromagnetically
That's certainly the case for dark matter. After decades of work we still don't know what it is, which has given the word "dark" the additional meaning of 'unknown'.
When it comes to dark energy, I think it mostly implies this second meaning.
I think it's fair to say black holes are a kind of "star", but the concept of dark energy and dark matter are something else.