It sounds like the game "Chases's MM2" might have been taken down by Roblox for violating their terms of service, which is why you saw the "[Content Deleted]" message when trying to join. This can happen for a variety of reasons, such as copyright issues, inappropriate content, or other violations.
It's also possible that the creator is in the process of editing or updating the game, which could temporarily lead to it being unavailable. If a game is under maintenance or editing, it may show as "private" or "not available" rather than "deleted."
To get more information, check Robloxās official blog or forums, as they usually announce major changes or take-downs. You can also follow the creator's profile for any updates regarding the game's status if they publicly communicate about it.