You aren't wrong. Steam has already updated it's game files to include all 4 MP maps and Origins. You can see the game glitch occasionally in MP today where it trys to rotate to 1 of the 4 new maps.
Also a side not to the creator and everyone else in here. As it has been said before there is no SAFE hack. It doesn't matter if it is in Public, Private, or Custom game modes. Anything that modifies the original files of a Treyarch game is monitored and investigated by TAC (Treyarch Anti Cheat). TAC is always running, even in Solo/Single Player hence the reason you are required to have an internet connection to be able to play the Single Player campaigns. TAC has also made it clear in past titles that they will not be like IW and stop checking for hacks after a new title is released. So even after Ghosts is released in november of this year, TAC will still be actively running on BO2 as it still runs on BO servers (even if there are few of those still in operation). So let it be known that no matter what a creator, coder, developer, or random user says: You CAN always be banned RANDOMLY. TAC and even VAC will ban randomly without warning and sometimes without a delay. So when downloading a hack from this website keep that in mind, especially for BO2 since TAC is on top of a lot of hacks and game file modifiers and usually banning for them within a week to a few days at the earliest. Just keep calm and hack on but just remember it was your choice to hack therefore it was your choice to be banned, not the creator of this program. Some of us may use this for months without a ban and others only a few hours or days before being banned but it is all randomized.