nope does not work. Here I took some photos
As you can see it wants me to buy the Ultimate game again, but says there is nothing in the store, and even though they show up under the "manage game" tab, I just get an error. It's so frustrating
Looks like you're in the actual PSN Store. I think what the previous poster was talking about was going in-game, and going to the in-game store. There should be a section called PSN Store within the in-game store which will guide you to the DLC.
BTW IMO I do think the experience sucks and is confusing. The ideal experience should be that it just lets you buy MK11 Ultimate, and discounts you based on the DLC you previously own. My path to upgrade for Aftermath was to buy the Aftermath DLC. But my path to upgrade to Ultimate was to buy KP2. If you go directly through the actual PSN store it's very confusing and inconsistent. And I still don't really know if I missed out on anything by not just buying the full on Ultimate bundle.