Black holes are only theory's, no one really knows if they excite or not, so what's the big deal ???.
It's one thing to make the claim that a black is not a singularity, and that a future theory will clarify gravity and quantum mechanics so that they can bother be accounted for which does not include a black hole existing as a singularity. It's also not much to claim all sorts of unknown properties regarding elements of black holes.
But to deny that black holes exist? That's a serious lack of knowledge regarding what is empirically verifiable through search.
If anyone bothered to try to shift for any meaning out the source, they might have saw that in the results portion of the study state its lack of including all relevant properties to even make the claim.
But collapsed matter with insanely high gravitational pulls, including black holes, can basically be observed in the universe at this point.