It's a gag:
"WWII Airplane Modeller for the B2 Bomber" - WWII and B2 Bomber = Nope
"Korean War Airplane Modeller for F16: Paper Cut" - Nope
"We give ordinary people like you the chance to build your OWN paper airplanes, by offering you great materials at an affordable price, and inexpensive shipping methods (Exceptions: California)." - They'll send you paper...