Still, I don't get where "virtuous environmental brownie-points" enter the discussion or how the first reply pertains to them. It seems like a simple factual statement that is either true or false and can be evaluated as such without invoking virtuous brownie points.
That the Amazon remained largely untouched is true regardless of whether that was the result of a deliberate effort, a technological limitation, a lack of need or any other reason. No one uses "preserved" until now. It can simultaneously be true that the populated areas of the Amazon where deliberately and carefully managed by the population and that the Amazon was largely untouched for any other reason.