A celebrity endorsement of a product does'nt make that product any more special or different than what it was before the endorsement.
A celebrity who makes a product and sell's it under his name is substantially different. Paul Newmans salad dressing products are 'real', his endorsement of someone else's salad dressing simply says he is getting paid to say he 'likes it'.
Due to the popularity of the SPF brand name it is a logical choice for a comparison to an original Cobra, based on sales numbers. But I agree, might as well compare a Classic Roadster or an FFR! A more interesting comparison would be a modern Shelby CSX, built closer to original spec with similiar engines, etc.
FFR small block, 'race specs', might just clean up in such a test!
Maybe it should compare to an FIA instead. Now THAT might be interesting.