The count of "since deleted pages" reported by XTools in the "general statistics" section (subsection "Pages", line "Pages created") does not match the sum of the details table shown in the summary table (column "deleted") in the page that can be reached clicking on link associated with the number of created pages.
For example, for it.wikipedia.org, I'm given 915 "since deleted" in the general statistics, but in the details the count is just 75.
Link to my general statistics: https://xtools.wmflabs.org/ec/it.wikipedia.org/Ysogo
Link to my details: https://xtools.wmflabs.org/pages/it.wikipedia.org/Ysogo/all