Excellent response, and good job beating out GiveWell. It describes the main difference between SCI and DtW as being the specific worms treated, but isn't it that SCI's effectiveness is based on health, whereas DtW's is based on education? Otherwise, I would think there would be a plausible case that today's studies generalize to SCI, as one of the many "worm wars" pieces was saying.
Of course, that's only the case if this re-analysis is worth its salt, which it doesn't appear to be.
Note that the hyperlink given no longer works. GWWC now has the deworming study response post at this updated link.