No, it does. The wikipedia post is accurate but incomplete: the substance shows up in turmeric AND cumin.
In about 2008, when the binding activity of curcumin to ABeta was discovered, researchers rushed off to stuff mice with as many different biphenolic spices as they could, and even observed a therapeutic effect.
Unfortunately, when the doses are scaled up to humans you would have to inject a tablespoon of curry powder directly into your brain every day to actually remediate AD by this approach, but I'm glad someone has found a use for the effect as a test.