If you are running knights of hollow hill agenda, does the plot cards in your deck still provide gold bonusses, or are they also cancelled?

Plot cards still provide their gold with this agenda. Would be almost pointless to run the agenda otherwise, no?

The gold on plot cards are not "gold bonuses." It is the base upon which bonuses are added. So the fact that the agenda makes it so that cards do not provide gold bonuses does not touch the plot card.