What's confusing about it?
Schooner is the variety of malt the prefix is telling you how its been malted (processed).
Just like Heritage Crystal Maris Otter, is Crystal made from Maris Otter. Just tells you that they grow and malt a lot of Schooner in different ways.
Back when, Coopers used it almost exclusively, its very good at making a beer just like Coopers, it was always a bit of a niggle that changing the mash conditions, the boil or anything else and you got almost exactly the same beer, which can be a mixed blessing.
Mark