Trusting Google’s Gemini with anything seems to me like a bad idea.

But here are unofficial answers your questions from a fellow developer:

• Your public game likely was delisted for the same reason thousands of games were delisted since in the past year: it has adult NSFW content.

• From observation, I’m guessing your game as it is won’t be reindexed. You have images in a realistic style of characters who look like teenagers being “corrupted” by an adult character in a sex game. You might be lucky to retain any visibility as the current practices go.

• Why did this happen now? If you’re accepting payments for a similar game, or it looks by keywords that you could be, then that might have flagged your account for another internal review.

• I’m not sure what counts as a duplicate game to the itch.io team, but I feel that’s not the issue here.

My recent experience with having a copy of a game in a restricted page while another was public didn’t delist anything. Altho, that was for testing and development, with the no payment option. Specifics might matter?

nearly two weeks ago

Your game was published 21 days ago. Unless you did this here https://itch.io/t/3693485/do-not-update-your-games-by-deleting-them-and-uploadin...  Please do not do this with a monthly version or something like that, if you can help it. It is very, very, very annoying and it absolutely can lead to people reporting your games for doing shenanigans or because they think the additional versions might have been uploaded by impostors and are malware.

There are people waiting longer than 30 days to get their game indexed at all. Or is the game on your profile the "duplicate"? Because that is not restricted. But it is quarantined, and not merely delisted.

Also, support will not answer such questions. And doubly so, not within two weeks.

If those projects are different versions, that's not duplicates. Having two versions of a game is not unusual.

And to round it up, if Itch would have a problem with your content and did manually interfere, they most likely would have removed it. Since you have a patreon running since last year or so, I very much doubt it, as patreon is generally stricter than Itch.

But since you do have a presence since last year and the game is only three weeks old, I would guess you deleted and recreated the game page several times. That is problematic for a lot of reasons.

tl;dr Any update can get a game into temporary delisting or even quarantine. And separated "paid" versions of games are normal. Itch even has integration for Patreon in some way (which might not suite a web version).