Sorry to hear about your situation, but Itch Support cannot be bothered to provide any sort of communication. Over 2 months they have failed to respond to three different queries, and there appears to be no way to receive help otherwise.
Viewing post in Game has been unindexed. What can I do?
I got a message yesterday from the moderator https://itch.io/t/3068503/my-games-are-deindexed#post-8550236, if I understood correctly, the support team can decide not to answer if they don't want to reindex my game, you may be in this situation. However, IMO, I think it is still necessary to continue to follow up with them by email (in my case, I have unanswered questions, I particularly want to know the exact cause of my first de-indexing, if only to to prevent this from happening again if I publish a new game).
The problem arises where there is no communication about the actions taken and the reasoning why. When our only procedure is to contact support for help, yet you get ignored, it's entirely frustrating and lends the idea they don't give a damn.
I can't guess on the specifics of why it happened to you. At least in my case I was initially notified of a complaint that Itch was being irresponsible, but somehow that became my fault.