I'm going to guess this is about that comic series ending with Sisko returning to the Celestial Temple. Which I think was more likely influenced by the fact that Lower Decks had already established Sisko never returned in an episode which aired right before the first issue was released (like a week or so). They were basically trying to reconcile the series with what onscreen canon had already established.
Which is funny, considering how much the creators leaned in to that series being "official canon" when it launched. I'm pretty sure we on the board all knew better, but that didn't stop them from making the claim.
So we finally got the episode that addresses Sisko and it does definitely confirm that he never comes back.
I have to admit, I was also in the camp of people who were disappointed that they basically ignored Sisko's promise to Kasidy, especially knowing the background as to why that scene was added, but that seems to be a minority opinion.

