Earlier quoted context omitted.
How private are those then? Isn't it true that at least everything is visible to at least all participants? EDIT: in other words, my question is actually whether your claim has relevance, considering how most crypto currencies aim to be public (or that's at least my impression).
No, you can't see anything, basically. You can only see your own wallet and transactions, and (AFAIK) you can't even see who sent you funds.
If it's just an application level shielding, as in a separation between user software that can't access the information but a layer/cluster of infrastructure software that can, then I'm not so sure if its nothing more than rather meaningless cosmetics.
Do you by any change have some references as to how this would work? because I sincerely believe that this statement of "decentralization means access to all" actually fundamentally holds.
EDIT: I'm also doubting the classification of decentralized, if a piece of the user software relies on something else that has more capabilities (essentially a typical trait of centralization).