Does he mean over the “last” 13 billion years? He is only observing ancient photons after all. Today, it likely no longer exists.
“This object may be one of many building blocks of a galaxy,” says the lead scientist. “Over the next 13 billion years, it may have dozens, hundreds, or even thousands of merging events with other galaxies and galaxy fragments.”
via Astronomers Spot Oldest Galaxy Yet – It’s 13.3 billion years old, nearly as old as the universe.