It is not really magic.
As I said, on this very same forum, there was a similar working way around the 21 days hold.

For what reasons people need to get their 21 days hold released is their responsability but I want to add that the hold can be very annoying and in my experience, the hold is not always fast lifted after filling in the tracking details. For new accounts, in my experience, it indeed doesnt take 21 days, but still can take up to 10 days after filling in the shipping details.
 Also, this 21 days hold does not go away after 2 or 3 sales. This can be different for other countries, but Paypal in my country puts every payment on hold during the first 60 days AND 10 succesful transactions. This is clearly visible when you go to Resolution Centre where it states that.