I probably badly worded that post. I was trying to further highlight how pointless RFID wallets are
As in, if you're the sort of person that wants an RFID protected wallet, surely you'd want ALL cards to be protected otherwise there's no point?
Separately to that, if you have more than one contactless card in the wallet, it doesn't matter whether the wallet is RFID protected or not as - if it's not - card clash will prevent the mythical skimmer from getting anything useful out of it anyway.
//edit: Ah, I see where you're coming from now - so you were saying it's clever because the RFID protection on that wallet allows you to store multiple contactless cards with one being used, making it useful for someone that gives no fucks about RFID protection but has multiple contactless cards...