No dog is 100% hypoallergenic. Not even poodles. But the best breeder breeds for a Labradoodle that even people who are allergic to dogs can own. If a breeder keeps throwing together dogs who do not have the proper coat genes that makes it more hypoallergenic, they will produce a dog that is not good for people who are allergic to dogs.
The more generations of the right coat genes, the better. The more stable and consistent it is. This is how you breed out the bad coat genes received from the Labrador.
Pigment means the color on the nose, lips, pads and eye lids.