It works on NHL 13, not sure about the rest. You can even boost in a game getting a lot of goals and once you reach the assist and goals that you need, all you have to do is start a game then go to exit and it simulates it for you but still counts as a game being played.
WHat Im wondering is, if you can use a save editor to get the boosts that are too hard to get and that would mean either playing legit for a few years in-game or boosting which takes the fun out of it.