No, Flue curing is the process of taking green freshly harvested leaf and putting it into a chamber. The heat and humidity is then raised on a pre- set schedule. The idea is to get the leaf to yellow quickly, then wilt and finally to raise the temp high enough to completely dry the leaf. This process "sets" the sugar level and usually takes about 5 days to complete. If you let the leaf age naturally, as in just hanging it in a barn the sugars in the leaf will slowly be reduced as part of the aging process. Flue curing is typically done with cigarette tobacco.
In fermenting you are taking leaf that has air dried over the course of a few months and putting it into a chamber. This chamber is typically set at about 125 degrees (F) and about 70% humidity. The leaf is left in the chamber for about 1 month. Fermenting basically speeds up the aging process to give you a good smoke-able leaf. Fermenting is not required but the alternative is to age your leaf for about 1 year before smoking.