Saying that this thing or that thing is directly related to global warming is rather simplistic at best. So in that regard, you are correct. But the CNN report is just as simplistic. It uses faulty logic. The systems in the different areas are separate. Something which affects one doesn't necessarily have to affect all or even more than that one.

For example, one reason that Atlantic hurricanes are more volatile than Western Pacific cyclones is the water temperature. In the North Atlantic, the Atlantic North Equatorial Current, the Caribbean Current, the Antilles Current and the Gulf Stream are all warm water currents over which the majority of the Atlanic hurricanes flow. That warm water provides the energy necessary for the formation of tropical cyclone systems.

When was the last time you heard about a south Atlantic hurricane? You haven't. That's because there aren't any. The South Atlantic currents are too cold to support hurricane formation. In the Pacific the situation is different. Cyclones which form off the west coast of North America are usually short-lived, because the southbound California current is a cold water current. If the system can stay together long enough to track into the Pacific westward-flowing North Equatorial Current, then some energy can be acquired from it. This is where El Niño and La Niña have their greatest effect.

The western South Pacific has the cold water Humboldt Current. This retards formation of tropical cyclone there.

In the Eastern Pacific the situation is much more complex. The currents are more numerous, they are affected by the various island masses, and there is a very strong counter equatorial current which flows between the north and south equatorial currents as well. The same goes for the Indean Ocean currents, in regards to complexity. None of the other tropical storm basins are as simple as the North Atlantic.

Add to all of that the fact that global warming doesn't necessarily mean more warmth in every local system. In fact, global warming can even cause cooler temperatures in some areas as more Arctic and Antarctic ice melts and enters the cold water currents which flow from them. Conversely, any warming of the currents will definitely cause stronger cyclones, simply because that would mean more energy would be available to drive the cyclone strengths.

All things considered, to state that one would expect an increase in other storm basin cyclone frequencies if global warming were to cause an increase in North Atlantic cyclones is rather simplistic.