That's right.
Plus the fact, that the question was "Can txos use this?" which may sound like nothing but a bare permission request.
Obviously hippy dave is right though. It's pointless to use on SX OS.
However you could say that due to the amount of people asking TX for sysmodule support they either support it at some point in the future or (at least) do what they always do: Steal and implement it. And if that happens, you might be happy that you started setting up AmiiSwap with your categories in SX OS (or wherever since it's stored in sd:\switch\amiiswap\ anyway).