Schwann cells (green) P0 myelin (Red)
If you want the more jaded side...I will not go on about the ethics of using a model that is so severe where death is an acceptable point of assessment, there should be endpoints before this happens., but this study transplanted cells into animals with EAE and there was greater survival and there was some remyelination that was evident after 3 weeks.
Is the remyelination causally related to survival?, maybe, maybe not, maybe they are producing protection factors that is limiting damage. Indeed we know that putting a needle into nervous tissue can create nerve survival factors. The necessary data is not present to discern this.
However now the problem. There has already been a clinical trial of Schwann cell transplantion in MS in Yale, USA and this study I believe was abandoned. Why? it is not clear because I don't think it was published......maybe you know why or if it is published where? Maybe they could not find any cells, improvement or there was worsening or some adverse effect. Technology has moved on since the trials but I am not sure of the fine details of the trials to comment.