Although it is non-toxic, paraffin wax is not what I consider edible. To me, edible is something that is digestible and provides some nutrient or energy value to the body. Paraffin wax will not poison you, but the body does not digest it, either.
It thins the chocolate, making it more suitable for coating, keeping the chocolate shiny and delays blooming.
It is not an ingredient I choose to use. I use Guittard covetures for filled molds and coated chocolate candies.