Hmm, I could have sworn that guide included SD card instructions. Well, when I get the chance I'll try an SD card dumper and let you know how it turns out. If you don't want to wait, the quickest way to find out would be to dump one yourself - if you have a game already in the database, dump that one and see if it matches.
BTW, I've never used an SD card to dump a disc and so don't have any experience with the dumpers, but
DVD-SD is supposed to be able to dump a disc in about half the time as Waninkoko's dumper. You'll need an empty card to use it, though, as it reformats the card in the dumping process.