Game not required to claim on Xbox or Playstation. Epic requires the game to claim DLC.
"To say thank you for being a wonderful community and for supporting us though the good, the bad and the future - The Tactical Weapon Pack will be FREE for a limited time."
Xbox:
https://www.xbox.com/en-us/games/store/crime-boss-rockay-city-tactical-weapon-pack/9NMWN9J5ZMS5/0010
PlayStation:
NA - https://store.playstation.com/en-us/product/UP4040-PPSA06381_00-CBRCTAKTKLWPNSPK
EU - https://store.playstation.com/en-gb/product/EP4040-PPSA06382_00-CBRCTAKTKLWPNSPK
EpicGames:
https://store.epicgames.com/p/crime-boss--tactical-weapon-pack