Oh, i see. Clearly I missed that post.
Seems to me that Black Ice is most likely Norton's answer to Micromesh. IOW a super premium sandpaper. I haven't used it. FWIW Rockler stocks Micromesh. Frankly for something like this it isn't that critical, IMO. 3M, Norton, Mirka - they all seem about the same to me. Good tools do save time though.
I rarely sand higher than P1000 when polishing aluminum - if sanding is necessary. Unlike with lacquer, fine sanding scratches on aluminum will polish out easily once you get to the compound.