According to the website (bitcoincashnode.org), the address prnc2exht3zxlrqqcat690tc85cvfuypngh7szx6mk is a "3-of-5 multisignature address held by team members".
Flipstarter is made so that as soon as the qualifying amount is pledged, it pays out. There is no need to wait. All the results are still there though so anyone can go see the pledges.
I see. It's not possible with the anyone-can-pay transaction. It has a fixed amount and anything you try to add over the fixed amount will just go to mining fee.