It means there was a surplus of pollen available.. The pollen can't be moved around will produce similar effects as hives that are honey bound. In spring I often pull and scrap dark old pollen frames since there is a plethora of pollen available then.
He may want to put the super on the bottom of the stack, under the brood boxes. The bees might use that pollen for brood rearing over the winter months and very early spring before flying weather allows them to gather fresh pollen. If it's still there in the spring the box can be removed
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