It's hard to explain unschooling, partly because the best answers are "it depends," followed by questions for the parents to consider while they're making their decisions.
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Getting unschooling is a process. There will be more to get once you're comfortable with the new understandings and behaviors.
"Radical" means from the roots—radiating from the source. The knowledge that learning is natural to humans can radiate forth from that point in every direction.
"Child-led, 'wait til they ask'" isn't the way radical unschooling works. It's a way for unschooling to fail, if the parents are twiddling their thumbs waiting for the child to lead, or ask to learn something.
Children have been whole, thinking, seeing beings since the day they were born. Assisting them to learn and to find their strengths and to explore the world and its possibilities is preparing them for their unseen futures.