Claim, vs being proven are totally different things.
There are thousands of people who haven’t cured MS but have seen drastic improvements. I doubt many of these people who even claim being cured were among the worst cases of PFS among us. I have had PFS for years now, many of the side effects do improve considerably with time, but I am still not cured or recovered in any sense of the word. At this point, persistent and permanent are both acceptable until we know more as far as I am concerned.
Thats why the studies are so important. Recovering naturally obviously is a rare feat that cant be connected to a specific protocol. There have been about 10-15 people who claim recovery. That number is tiny in comparison to the number of people registered.
We will have to be patient with the studies. It will take at least a decade for significant progress. Until a cure is found we might be under the ground already. However we still have to pursue this path.