Hmmm... I'm going to have to respectfully disagree, Bill.
Static balance equals out gravitational forces.
Dynamic balance equals out inertial forces.
I care more about the balance of my wheels when they're spinning versus when they're sitting still.
Way back when I was in high school auto shop (yes, we had cars back then), we were taught static balance was the least reliable (better than nothing though) and dynamic was the way to go. Nowadays they've come out with dynamic load balancing (for the auto world anyway) where they put a load on the tire that simulates what the tire/wheel assy will see in real life, and this is reported to be even more accurate.
Just as in engine balancing, dynamic balance is better than static. Any engine builder with a good scale can do a static balance, but it takes specialized equipment to do a dynamic one.
I guarantee you this engine - with the equivalent of 145,000 hp - is dynamically balanced.