It didn't, he's just making a guess based on a Nomura statement and old data found in X
I'd rather use the word hypothesis, I think that Chi shutting down on September was intentional before the announcement so that both games could have a further diverge away from each other.
Exclusive Interview with Tetsuya Nomura on Kingdom Hearts 2.8 & KH3 - News - Kingdom Hearts Insider
"The newest update to Kingdom Hearts X[chi] introduces a new world, Beast’s Castle. Why was this world chosen to be added to the game?"
Nomura: We are prioritizing the worlds of the seven princess’s based on the “fairy tale era” concept in KINGDOM HEARTS χ[chi].
"Is there any significance in the timing of Beast’s Castle’s introduction to Kingdom Hearts X[chi]? After so many main story updates, it was surprising to travel to a new world rather than continuing to investigate Ephemera and the Foretellers?"
Nomura: There is no significance to the timing. We had already made a decision on which worlds to select a while ago, but because new world additions are the most time consuming, we were finally able to implement it this time.
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