your data and methodology to arrive at this summation, YOUR apparent "foreordained conclusion", is missing...
the article provides a link to PubMed (and the study abstract)... from there you can quite easily gain linked access to the full study as originally published in the "American Journal of Medicine" - Gun Ownership and Firearm-related Deaths ... study authors are two medical doctors from the New York University School of Medicine
the article appears fully sourced... in regards your question, per your own quote of the article, both studies referenced have provided links.
again, the Slate article's linked reference (politico.com) speaks to the origination of "DGU" (as used by the gun industry/proponents) as the 1992 random digit-dial survey of 5000 individuals... that was extrapolated to the U.S., at large, providing the "de-facto" claims of a U.S. DGU estimate of between 1 million and 2.5 million defensive gun uses per year. Of course, the article also speaks to other studies/references that dispute this figure; that speak to bias in that 1992 "phone survey".
an article and results you clearly don't favour is..... "propaganda"??? I read an article that is heavily sourced with linked references. You appear to have no interest/inclination to actually follow the sourced references. Is there a problem?
It is garbage, as I have just proven in 15 minutes on the net.
Absolute anti-freedom propaganda perpetuated by scum with an agenda.