Not enough information.
Charges were pressed, but the story didn't indicate whether witness statements supported one side vs the other. The story didn't indicate the relative sizes of the two men.
The story did say the "veteran" approached being verbally belligerent, and that a shoving match ensued.
In such a case, who started the shoving? Was there a size or age or infirmity related disparity of force involved? Did the CCW holder have a reasonable avenue of escape? (If he was not in his car at the time, then it might not be reasonable to expect to get into the car without getting pummeled, choked, slammed with his own car door, etc.)
So, it's hard to say whether the drawing of the gun was reasonable.