I don't know. While I felt that this exam was quite different from the practice exams, I don't know that it was universally seen as easier. I for one wanted to stab myself in the head by the end of it.
The scaling is based on the distribution of raw scores. So yes, if everyone did better on this one, it would make it harder to get a 990. However, ~1000 people take this exam, and they all have varying degrees of preparation for it, so you will always get a broad range of scores. Good luck!