This message seems to work for people. It’s unfortunate we have to just copy appeal messages but it’s the only thing that works.
Dear Roblox Moderation Team, I am reaching out to appeal the termination of my Roblox account, [Username]. For avoiding moderation via making an alternative account. I believe this moderation must be a mistake. My siblings and I all play Roblox and share the same IP address. My brother has had his account terminated in the past, which may have caused confusion and led to my account being falsely flagged for evading moderation. However, I want to clarify that I have not created or used any alternate accounts to bypass moderation actions. I kindly request a thorough review of my case. Thank you for your time and consideration. I appreciate your assistance in resolving this matter. Than You, [Name].