Do you have some references for that article?

In principle, primordial black holes can be dark matter (but not "stars"). I have written a few blog articles on that here and there, that you may find interesting.

I am a bit confused by the rest of your message, which is why I would like to have a look to your references to be able to provide a better answer. Technically, the event horizon can be seen as a sphere from the eyes of the human observer. In contrast, the matter accretion disk is of a torus shape. Maybe the two are mixed in the article?

In addition, we have no access to spacetime located inside the event horizon. Anything falls forever inside (including dark and normal matter, as well as light).

I am again a bit puzzled by the claim. I will thus wait for the sources :)