Unschooling seems like a strange term to use when describing an educational curriculum used by homeschoolers. It sounds like you are undoing something done by school instead of a proactive teaching approach. Reading about unschooling as a homeschool approach at Time4Learning:
"Contrary to how it sounds, Unschooling is an active learning process, and not the passive, unstructured method that it sounds like. Unschoolers are homeschoolers who are focused more on the experimental process of learning and becoming educated, than with 'doing school.' The focus of unschooling is on the choices made by the individual child, dictated by interests, learning style, and personality type."
My suggestion is that the unschoolers of the world get a new public relations agent and rename the curriculum to something that is more descriptive and less negative, like say maybe experiential homeschooling.