It explicitly states that the oxidation products retard development, and their removal accelerates development rate. Therefore, they state that sulfite addition accelerates HQ and Metol development. That is what I was referring to as well as the reference to the superadditive effect between Metol and HQ. The utility of the Elon Ascorbic acid developer (Metol=Elon), known at Kodak as EAA is well know as well.