I don't need no stinkin' link's/
Just like any politician or government agency announcing the results of from spending $100,000 to tell us something that we know from common sense.
Water is a diuretic. Well then so is food because anything that contains water is a diuretic.
Your expert claims coffee is not a diuretic.
Then he says it is if you drink enough.
First he says no then he says yes.
The expert you like to cite has no problems speaking out of both sides of his mouth.