Is it correct to assume that "pollenation = nectar collection"?
No. Everything depends on where you live. Up here, there are blooms that produce pollen in Februay and if it's warm enough for the bees to fly they will collect the pollen. Pollen is available to the bees before the nectar flows. In the spring, they will mostly collect pollen (because there is no nectar flowing.
Thanks for the opinions. (I am learning that is almost all there is in this hobby... "opinions".
Now you are learning! Another thing about beekeepers, they are
always willing to share an "opinion", even when it is not asked for.