no, you probably still will not be covered. they didn't give you those parts, subaru never certified warranties for those parts on a wrx, and the dealership has no verifiable means of checking vintage, etc.
as a side note about this thread, isn't it all just semantics? I can't tell you how many times i've complained about saab "voiding my warranty" when i knew all along that parts still applied. it's just easier and faster than saying, they "denied my claim so i can only get non-related parts covered through them."