I think that only refers to you waiting for your letter-writers to fill everything out. Cuz you know how you have to designate the people first and then when the ppl finish filling it out the status changes to completed. I think you will need to designate them again if you're going to reapply. However, it's a good question whether or not the schools you're reapplying for keep your letters. But what if you apply for a school that you didn't the previous year? You'll need letters for them. So it might be a good idea to submit them again.