Turbulence intensity applies to the air around the aircraft.
The sustained load factor applies to the aircraft itself.
These are apples and oranges, one cannot be directly compared to the other.
In a simple model of a high-G turn, the air remains stationary, and the aircraft increases its lift N times. Thus its wings have to be designed to carry a load of N*...
My question boils down to: how an aircraft can withstand very high momentary forces but not very high sustained forces.
From your question one can gather the maximum manuvering load factor has remained the same, and the turbulence intensity for design criteria has almost doubled.
How is it possible?
Fiber reinforced composites.
These materials can ...