I have no idea but if i were you: Use it before nexon realizes they made a mistake (if they did).
My guildy got 70k nx free from nexon and they quickly removed it, but he had the chance to use it, he only used some of it and after they removed it he still kept the things he bought.
My guildy got 70k nx free from nexon and they quickly removed it, but he had the chance to use it, he only used some of it and after they removed it he still kept the things he bought.