Ok, I get that Air pumps are more efficient at moving water, but in my opinion we are not comparing correctly. If someone figured out that an air compressor moves 3200 gallons of water that's great, but that water can only be moved upwards from the bottom of the pond. I would guess that a good portion of that oxygenated water gets pulled back down immediately to be pulled back up without helping to circulate new unoxygenated water. So some of that lifted water flow is useless. Also, you are limited to a certain diameter of flow from the center of each diffuser. As you get farther away, the less water is moved and therefore oxygenated. This makes it necessary to need multiple diffusers to prevent dead spots towards the outer shallow areas. This is not an issue if you are strictly destratifying the water, but it is less effective for oxygenating the entire pond. The only way you can compare a pump in the same fasion is to set it on the bottom attached to a pipe that stretches to the surface. That is how the pump is rated in GPH. If you remove the pipe, the water flow increases considerably because it is dragging surrounding water with it to the surface. Add the eductors to the pump and you increase the output even more.
Now, if you use a pump to pull oxygen rich water from the surface of one side of the pond and move it via pipe to the bottom at intervals across the ponds bottom to the other side you create a current that includes the entire pond and oxygenating all areas. This is because that the water has no choice but to travel back across the pond to the pump. This means that you are now moving the entire ponds volume of water not only vertical, but horizontal and oxygenating the entire pond in the process. You would not be pushing that water as fast, but you are utilizing the flow rate in a more efficient way.
Food for thought.
