You are correct. The sale is a non-sale.
from: https://torf.mmo-fashion.com/collections-unlock-costs/
Collections Account Unlock Costs
LAST UPDATE: 5.5 on 10 Oct 17
NOTE: There are now only three unlock prices. Bronze = 60 CC, Silver = 240 CC, Gold = 400 CC (though some free items can be unlocked for 1 CC)
Those armor unlock prices are the same, during this 50% sale.
I also checked Color Crystals, Mounts, Pets, Toys, Titles, Emotes, etc. None have the 50% discounts.