That is almost exactly what it means to not be under the rule of law, when laws can be applied selectively you technically aren't under the rule of it, if there is a group above it they also can get away of going against it.
The other side to rule of law is that the government can't punish you arbitrarily - they need to have an applicable law, and they can only apply it to you as written (including penalties etc). In a system without rule of law, a subject can be charged with wrongdoing on the whim of the ruler. That part is also missing in KSA.