Scott, if it is delamination, then the bubble will continue to grow. As air under the bubble heats up and then cools down, the bubble will stretch and eventually crack and split. What the salesman said does not pass my smell test. As
Bama Rambler indicated, call FR as soon as you can.
So this happened to me many years ago when I bought a Coleman tent trailer. Even though the roof was under warranty, the dealer wanted $600 for freight to replace the roof. I am not suggesting FR or the dealer will treat you this way, just that you should not ignore the issue until you get it resolved, or you receive a satisfactory answer from FR.