That's precisely the point I addressed. The "Mac Pro club" example isn't relevant here because it's a membership that results in the delivery of a single produc

That's precisely the point I addressed. The "Mac Pro club" example isn't relevant here because it's a membership that results in the delivery of a single product at a single time. There's a reason nobody structures membership deals like that. Amazon Prime is a flat membership fee, after which you receive a number of unmetered benefits. Some of those benefits include products that would normally cost money being available for no additional cost. The use of the word "free" to describe offers like that is unremarkable.