That's not it. We can figure out what the mass makeup of the Universe is through various independent means, and those are also independent of direct observation. Those lines of evidence tell us the Universe is a 69:26:5 split between dark energy, dark matter, and ordinary atomic (baryonic) matter. None of that has changed.
However, we've only been able to actually detect much less than that 5% contribution of the atomic matter in the Universe, meaning that we expect there's a lot more ordinary matter out there that we can't see. This research indicates that a big chunk of that missing ordinary matter is in the form of huge warm gas clouds on galactic scales.
However, we've only been able to actually detect much less than that 5% contribution of the atomic matter in the Universe, meaning that we expect there's a lot more ordinary matter out there that we can't see. This research indicates that a big chunk of that missing ordinary matter is in the form of huge warm gas clouds on galactic scales.