I hope this is not true. Applying uniform G's over a tower (considering the tower as a rigid structure) underestimates the seismic overturning moment and definitely is not what a building Code is asking for.
A building code asks to consider first an equivalent lateral force and it is true that Cs of ASCE 7 can be considered as an equivalent acceleration applied to building. However, after that, the base shear force is distributed across the height of the structure considering a vibration shape that is representative of the first modal response of the structure- usually the distribution shape is an inverted triangle.