You're making a semantic argument and I believe you are abusing the term CURE. I also don't believe we have even anecdotal information for all seven of the non Donepezil participants.
We do not yet know if these patients will continue to retain their lost skills. We also don't know if they have gone back to a pre-disease state "normal" which would be required to say they are "cured" in any sense of the word.
Also - diabetics can do well with insulin, asthmatics take drugs to improve breathing, but neither is cured.