It did cure some people, it yielded some improvements on average but it did yield extreme improvements in some people. That part isn't controversial.
> (and even if it were noticed: periods of lucidity are not rare. It would probably be ignored)
A year of being able to walk and talk normally when a patient could barely function at all would be noticed for sure.
Cure has a very specific definition. I don't think it applies here.
Look up how double blind tests are done on things that involve surgeries (eg implants)
> And of the ones that are, the family wouldn't notice the dramatic cognitive improvement shown in this article, but they noticed it here?
Because they’re primed to look for that improvement because they’re told that is the expected outcome