The Super Suite is a bundle of the available products and versions available at the time of purchase.
It is the equivalent to purchasing all of our currently available products individually, just at a discount. When new products or upgrades are released you would still have to purchase the upgrade or new product if you want them.
Since you purchased Super Suite back in 2013, and MySQLi wasn't available at the time of your purchase, it isn't included in your Super Suite package.