I found that section on 'cheating' completely bizarre. The reason something like a cheat-sheet counts as cheating is not that it's easier, it's that you haven't really learned it. The moral issue comes from the idea that the exam is meant to give an idea of how well you know something, and if you cheat you can get a good result without really knowing the subject matter.
If you are actually learning, and the effect is not temporary, then it's obviously not cheating, no matter how easy it is.
If you are actually learning, and the effect is not temporary, then it's obviously not cheating, no matter how easy it is.