Sucking on a CBD lollipop could actually increase bioavailability compared to other CBD edibles. While the lollipop spends time in your mouth, the CBD has a chance to be absorbed directly into the bloodstream through the mouth, in the same way that sublingual CBD works.
Whatever is not absorbed will be swallowed and consumed, broken down in the same way as other CBD edibles.
Basically, CBD lollipops give you the best of both worlds. As the CBD is absorbed in the mouth, it can take effect quickly and increase bioavailability. But since some of the CBD is digested, you also get the long-lasting benefits achieved with other edibles.