You've taken that right out of context. It's not a dismissal but an expression of amazement. As in: "I can't believe that happened!". The article clearly states the result was accepted immediately:
> Within a remarkably expeditious three weeks, the paper’s referees confirmed that Zhang, an unknown mathematician, had proved “a landmark theorem in the distribution of prime numbers.”
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[ 0.18 ms ] story [ 18.7 ms ] threadGatekeeping in a nutshell. Gotta love academia.
> Within a remarkably expeditious three weeks, the paper’s referees confirmed that Zhang, an unknown mathematician, had proved “a landmark theorem in the distribution of prime numbers.”