if the state, or even the court, were using an actual gun law to do this, you MIGHT have a point. However, that is not what is happening here. The court is using a vague definition in a disorderly conduct statute to make people afraid to exercise a right in order to avoid the citation that they redefined.
Not in what you posted, they issued a straightforward opinion, even discussed your notion of a "vague definition," and reacting to a known gang leader displaying a gun in public doesn't quite seem like trying to "make people afraid to exercise a right"