I don’t think people who had their game unlisted received a direct warning or ban but instead a message in the inbox (The one i showed you at the first reply) for hangout specific games due to a policy update which is stated here:
This policy update happened around Today and Yesterday which means it is highly unlikely that your account punishment has caused this. I also looked through the game you linked and it is marked as a social hangout which is the type of games which were affected by this
If the ban you mentioned isn’t connected with the game at all nor are you the owner of the game then i don’t think you can cause the game to be unlisted