Why do you assume that?
because aa does the same thing, issuing a challenge. and even if you take the platinum challenge which gives you gold right away, they don't issue you a card. (even though that could be because they assume you'll shortly be platinum... but i dont think so)
also, i just don't think it makes sense for them to be sending out status packages to everyone that has it for 90 days i'd love to be wrong though. anyone know?