Let me explain this: The other levels prior to the World of Nekudim (e.g. the worlds of Vision, Hearing and Smell of Adam Kadmon) can properly be called levels leading to the world of Atzilut, because they continue to possess the same quality they always had. When we examine this more closely we find it to be one quality which steadily approaches the Likeness of Man that typifies Atzilut, although it is still a little distant from it because the development is gradual.
However, we cannot call the World of Nekudim a “level”, because it is not something that endured. It existed, and then it was negated, and now, in its place, is the actual Atzilut. If so, Nekudim cannot be called a level leading to Atzilut, because if it were, it should have remained in existence. Otherwise we would be faced with a “leap”, because one level would be missing, while the supreme intention was to arrange all the lights in order, one under the other, and if there is no need for this level now, it was also unnecessary at the outset.