Well, yes, but then again, he could also spend a refresh on a homebrewed 'stunt' giving him +3 to guns attacks, with no other restrictions or stipulations, and as applied to his current skill list, it wouldn't significantly increase the threat he posed. That wouldn't mean that a stunt giving +3 to guns attacks, in itself, is 'balanced'.
But that just goes back to the npc power-balancing comments.
The 'stunt' isn't a problem in this instance, because it's being applied to an npc, with a relatively small game impact in combination with the character's skill selections