I have not read the studies. It is important to know whether IVM is 200 times more effective or 50% more effective.
Simply "more effective" is not sufficient information to make informed decisions.
Pretty sure sugar is 0 percent effective against covid. Real question is what is safest, most effective, supported, legal, easy to get, cost effective, and doesn’t involve a trip to the Billy Bob’s Farm Supply. Or better, is the vaccine safer and significantly better than the vaccine? Only way to know would be to do a head to head study. Which won’t happen because what data there is says the vaccines are better— even after they have lost some efficacy.