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Lets not trivialise this announcement.
Given that the prediction is that we won't see any galaxies more than about 13.5 billion light years away, and that previously, the most recently known, most distant galaxy was 13.1 Blyrs, (z=8), 13.2 Blyrs, (z=10.3), represents a big jump closer to the limit.
The discovery also used the 'dropout technique', which is very elegant and simplistic as it uses successive filters to determine the distance.
The brightness also tells us how many stars were forming there, so comparing the last known one to the present observation tells us a lot about how the Universe was changing over that timespan.
When the James Webb scope gets underway, we should see more galaxies at this distance, which will also tell us how prolific star building was way back then … which should also tell us more about how accurate/inaccurate galaxy formation theory, presently is.
(All pretty cool, from my perspective).
Cheers
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