All of this is true. I will add that tropical fish are very adversely affected by chloramine because they can add so much more to the water without it smelling like bleach (because it does not directly off-gas as straight chlorine does). Fish are affected by chlorine because it damages the membranes on their gill. Air breathing animals (poultry and people) are not affected by chlorine (or chloramine) in the water, rather, we are affected by the gas in the air (do not sniff bleach on a regular basis, it can damage your lungs).
So the change will not affect you or your birds. In fact, it may help in that the water in their pans will stay bacteria free much longer. Some people even add bacteria fighting agents to their poultry water, and chlorine-based disinfectants are among the best for this.