Response to D-76 pH rise?

In reading a paper by John Sexton about T-Max films he states"If you use D-76 developer be sure to use FRESH D-76 (not some that has been sitting around in a half full bottle for a month!) As D-76 ages a chemical compound, hydroquinone monosulfonate, is formed. This chemical compund will INCREASE the activity of the developer and the contrast of your negatives in a big way with T-Max." I wonder if this is not the increased activity that is being attributed to a rise in pH?

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