Hmmmm, I wonder if the new code, "Gold/Platinum Plus." etc., is somehow representative of a point value that is being assigned to your week?
I think this is the season name within SVN -- that is, it's the "new" season name, not the one on your deed.
If you recall, we recently discovered that the new StarOptions charts had new color coding on them, with new season names. So my deeded Kierland Platinum week is listed on the new StarOptions chart in a pink color, which is shown as "Platinum Plus" in the footnotes (orange weeks are called "Platinum", pink are "Platinum Plus").
When I look at my II account, I see that week listed as "Westin Kierland Villas - Platinum Plus". Granted, this is in my SVO-provided II account.
Weeks at Kierland were originally sold as Platinum, Gold, and Silver; but the new chart shows Kierland weeks designated as Platinum Plus, Gold Plus, and Gold.
So I'm guessing the season designations you're seeing are just Starwood's new season names, not any particular point value from II (although they could be closely related).