Aluminium may be, but interior of the can is coated in plastic (some quite unpleasant), and painted/coated/labelled externally too.
I agree, to a point. My initial comment was related to the "100% recyclable" bit. The aluminium certainly is, the can itself isn't just aluminium though. This wasn't to say that cans aren't better, merely to draw attention to the fact that it's never as simple as we might like (and bisphenol-A, one of the common ingredients in the epoxy lining, is pretty awful stuff).