I'm not sure what you mean. Our content is properly flagged as 18+. We weren't even aware it was deindexed and hidden until we went looking into the analytics tab and saw a complete cliff dive for visibility... then we read this subforum and realized we weren't the only ones hit by the recent algo changes.
I have no idea what he Itch staff implemented on the backend to deal with malware and spam, but whatever it was it's also flagging legit projects (like ours) that have never had issues in the past.
Please look into the issue!