As I could see on some YT Videos and after some researching It was an online only DLC, that means It was only available for the Multiplayer Mode and since the online servers for Xbox 360 and PS3 are shut down, I don't think you would need It, unless you're playing It on Xbox One thanks to the Backwards Compatibility.
So, in other words the GB2 Flight Suit and the Gold Proton Pack can be used for Single Player Mode.
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