Sadly the Indians were just promoting that propaganda to smear China. China's dam would not and can not seriously affect the water downstream, most of the water in that river come from within India and Bangladesh.Ironically, not too long ago the Indians were so concerned about China's plan to build a dam in the Yarlung Tsangpo (Brahmaputra) river that might affect the downstream waterflow to India and Bangladesh.
Don't know if that project is actually still on or not.