Misleading Information
Cellulose does absorb moisture but it is mold resistant in view of its boric acid contents. But according to the installer it dries up fast in view of its material nature. There are other insulation materials which also absorbs moisture but not mold resistant and might lose its performance over time especially in air conditioned rooms as shown in the image below. The mold / fungus grown might be hazardous.
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Cellulose were put in good use for keeping house warm (in winter) and cool (in summer) in western countries with four seasons. The question of moisture absorption should be negligible viewing its wide usage in western countries in keeping house warm during winter.
However, the decision on the type of insulation materials to be used is still at the discretion of the consumers.