Universe’s ‘missing matter’ finally found in the space between galaxies

No, this is about the missing baryonic matter.

No, the dark matter is still dark, and was never missing, because we know it's there from its gravitational effects. We just can't see it (hence "dark") and don't know what it is, really. But whatever it is, it's definitely there. Well, actually there are some who say it's an illusion, but nobody says it's missing.

The missing (baryonic, i.e. ordinary) matter on the other hand, is matter that theory predicts should be somewhere but we didn't know where it was, i.e. it was missing. This research says that it's in intergalactic space, which everybody kind of thought but wasn't sure. Now, using their techniques of looking at the way frequencies from fast radio bursts spread out they can basically "see" it, so it's not missing anymore.

A Nobel is not likely for this work, because it doesn't change our understanding of the Universe in any significant way... but it's pretty cool, anyway, they deserve a toast, and "found the missing matter" will look really good on their resumés.