Most stem cell therapies produce benefits through the signaling of the transplanted cells, near all of which die off rather than integrate. This is an example of an approach that goes beyond that, providing a set of more organized cells in a thin tissue segment that looks more like the native tissue. When this was done for the heart, 10% of cells survived (this is a large number in the scope of stem cell therapies).
So it is interesting to speculate on the degree to which the benefits here are signaling versus cell integration. Clearly the big difference between past attempts is that a tissue-like set of organized cells are delivered rather than just free-floating unorganized cells.