Besides Cute Orca Ayi was also implying something:
He seems to be implying there was 13 years between first flight of J-10 and J-20, and this year has been 13 years since first flight of J-20 so maybe we should expect something, some people in the thread are guessing 6th gen:
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It seems a bit suspicious that the two of them are implying this at the same time, but then again those two are close friends so who knows.
They know Deino is reading their Weibo so they are trolling Deino.