That's what happens when people dump encyclopedic amounts of information when it's almost entirely irrelevant to the query! Sometimes less is more.
You stated in your first post you have a non-protected Priv. There's a grand total of one discount available for this Priv on Oyster, which is the NR Only discount. If you want it, you must go to one of the ticket offices in that post I linked to and they can do it for you.
I have it on my Oyster card and it is great as it avoids the need to go to a ticket office and allows more flexibility for a lower price.