Just came across this yesterday on reddit. Apparently there is a leftover sp map in the files from the abandon campaign port. I started digging around in the files myself but didn't see any reference to the map shown here, I'm assuming the guy just swapped names with a multiplayer map and started a lan server. https://www.reddit.com/r/blackops3/..._some_xbox_360_modding_and_i_figured_out_why/
It would have been the same campaign but judging by the changes that had to be made to the MP maps, there would have been some serious changes to scale down the scope of the large set pieces in the campaign.
Its just a PC version with lowest settings. Just look, how much poly count on game models, or flame particle. There is no any campaign files in 360\PS3 version. And look, how all game cutscenes are broken in last gen version