I have NOT read the original paper, just the science media posts touting it.
I find it presumptuous. For a start we still insist that the Universe is continually expanding. If so, we don’t actually have a handle on how big it is. I also know that we, even with radio telescopes & Hubble, can only see a small part of the Universe. Then there is the claim that the Universe is infinite or close to it.
So, to make this claim based on the LITTLE bit of the Universe we know about seems irresponsible.
What irks me is the undue publicity these studies get, with the sensationalistic tabloid-headlines which do not give the average layman enough context.
I am willing to believe that Dark Matter & Dark Energy COULD account for a v. large part of the Universe. I am just uncomfortable when we try to get this precise based on what I consider to be a very small sampling of data.
Check Category ‘astronomy’.