Here is the paper
This is almost the same result that was available for anyone to see in death rates for people taking ivermectine regularly against river blindness in sub-saharan Africa versus the people living in the rest of Africa:
The explanation given by CDC and others was that these statistics are not done scientifically with double blind control groups and the medical care in these country is inferior and many cases go undiagnosed and so the results are unreliable. However, they too signal a 90+ percent reduction in death rates from COVID. One caveat: Sub-saharan Africa has a much younger population than the rest of the world.
Conclusion: Every day ivermectine treatment is not approved cost lives. 90% of the COVID deaths could be avoided by just approve the drug to treat early COVID, a drug that is already approved for other purposes, and in some case mandated for about 2.4 billion people.