I think it would be best for you if you delete this giveaway.

Like any game that has been given away for free in large quantities, The Slaughtering Grounds is not allowed as a giveaway on Steamgifts. Giving away games that were previously free is against the rules. Also, making fake giveaways (such as giveaways that are not for the item they purport to be) is also against the rules. For more information, please see:
https://www.steamgifts.com/about/faq
https://www.steamgifts.com/about/guidelines