The presumption is that Universe is 1.3+ years old, and this is 50 millions of years after the wall of the background microwave radiation.
IDK why they posit a barrier when they can't see that far back. 
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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