Universe Today has a more accessible explainer about the claim that Black Holes are the source of the observed Dark Energy in the Universe:

In their papers, the team led by Duncan Farrah (an astronomer with the University of Hawai’i at Manoa and a former Ph.D. with Imperial College report the first observational evidence that black holes gain mass in a way consistent with them containing vacuum energy. Whereas astrophysicists have been looking for a theoretical resolution to the problem of Dark Energy and Black Holes, the team’s findings allegedly constitute the first observational evidence that black holes are the source of Dark Energy.

If true, the finding removes the need for singularities to form at the center of black holes, resolving a long-standing debate. It also means that nothing more is needed (no new forces or modified theories of gravity) for our cosmological models to make sense. 

Regular caveats apply of course, but this would be a significant advance in our understanding of what’s going on out there...