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Out of curiosity, did you try going to Account settings -> Privacy and untick the box that says to share all your activity with other users? I’m not sure if it includes comment to games, but it’s worth trying it out.
Also please be aware that leaving comments in a game’s page is considered “public”, and anyone who visits that page can see that comment.
Apart from that, as far as I’m aware support seems to be very busy lately because of the big bundle that Itch had. I’m sure they will respond when possible.
We haven’t received any support tickets from the email address on your account. You must contact our support team using the email address that is on the account in order to have us make any changes to it.
Can you tell me more about the privacy issue you’re having? Maybe we can help you there. You want to post comments but you don’t want anyone to see them?
We feel that there are many other tools to facilitate private communication, and we don’t want to enter that space. There are many moderation, security, and safety concerns that arise when you open up accounts for private communication. We recommend that if developers wish to receive private messages about their work, then they provide relevant links or email address directly on their page.