Forgive the me if this is a stupid question, as I don't have the SR5 rules yet. But isn't it possible that there are cheap decks with terrible stats that exist, they just aren't on that list? Kind of like the free cyberdeck you get on the Genesis SR video game.
I'm 90% sure there are, yes. Whether the stats on them are high enough to be useful is another question, which I don't know the answer to. (I only have the versions of the Matrix chapter that I proofed, not the one that was released with the actual book, so I can't speak to what the published version is.)
Edit: Never mind, RHat noted that the deck he's talking about in the OP was the cheapest one available.