that report deliberately (I mean consciously, not underhand) ignored the issue of pesticide contamination in food, and the damage that long term pesticide and inorganic fertiliser can do to farm land and runoff in rivers. My guess is that most fans of organic food never supposed that vitamin for vitamin (or whatever) the particular vegetable itself was actually more nutritious, but rather the bigger picture is what is at stake, and that is the toll that inorganic farming takes on the land, and also the long term health risks associated with pesticides that have not been sufficiently tested.
Furthermore many hop varieties are now bred to be resistant to mildew and wilt which are the main problems. As far as pests go, some organic hopyards let animals such as sheep and ducks roam the yard to eat slugs and keep the weeds down (once the shoots are big enough that they don't get eaten themselves!)