If I am understanding your question correctly, you are wondering if the stats on items that you already had should have changed and the answer is no. As far as I know, the stats apply only to monster drops and crafted items starting from the date of that update.
You can put the substat that you want on your item by using a Blank Enchantment Scroll to remove that substat from another item. Just be careful that the item grades on both items match. If you have an event item, the substat must be taken from another event item, for example. You may also be able to buy an Imbued Scroll with the substat already on it but again, watch to be sure that the item grades match.
Here are a couple of links you might find helpful
All gems currently in the game and where they can be placed http://rose.irowiki.org/wiki/Gems
All possible substats (from drops or crafting) http://rose.irowiki....isal_Stat_Chart
Welcome back! If you have any other questions, feel free to post them here at the forum or pm me and I'll be glad to help if I can.