Hi Rojo,
First, for credentials, I'm a tenured PhD scientist at a Tier 1 research university. I'm not a virologist, but my lab uses recombinant virus for all kinds of things. I'm a competent molecular biologist and could design a covid test from scratch, including for specific variants.
Your question raises an important point, and really asks about the scientific method and how we evaluate evidence.
1) A random chart on the internet with an official looking graph is not evidence. Is not, is not, is not! What were the studies? Were they crap, were they legit? How does one know? Well it takes some work.
2) Good studies are published in credible peer review journals. For the chart you show to be legit, it would reference multiple studies in peer reviewed journals. Not junk journals, but good ones, with respectable impact factors.
3) Key findings, in this case a meta analysis, are repeatable. So for the chart to be accurate, the same meta analysis would need to be repeated by other epidemiologists and published in credible peer reviewed journals. It would need backing by multiple independent studies that had cleared peer review in respectable journals.
4 The above is the way science works. In most cases individuals who dispute this system claim to have special knowledge, or cite contradictory information out of context. **They are really challenging the scientific method at large. Kind of like the local jogger showing up and telling you how your ideas on aerobic conditioning are all wrong. $$You know, the guy that has the secret system speedwork only system that will turn someone into an Olympic 1500m finalist on 25 miles a week. You know it's wrong, but a less informed person might buy it. Anti vaxers are that guy.$$
5) So the the even bigger question is one of epistemology, knowledge, how does one even evaluate evidence? Is Joe Rogan the answer, or would you trust the consensus opinion of field of experts devoting their lives to understanding virology? Heck, although I could design a covid test and am more than capable of reading and understanding the primary literature, I still go to my virologist colleagues when I have key questions. I know enough to know they know things I don't.
6) Specifically on the point of ivermectin, there is no direct protection from covid. Tons of junk studies! Okay studies that do show a benefit were in populations with high parasite burdens. So real health benefits were likely from de worming. No effect and even harm in populations with low parasite burden. If you think you have parasite, ivermectin may help you;)
7) In my opinion? How can I know that without reviewing ever single study? I can't. But I do know that if the same conclusions aren't showing up in other meta analyses, it's already suspect. Think about it. This would be a huge deal! As competitive scientist I'm always looking for novelty, edge, the big finding, It's hard. And if something like this chart was supported by evidence, the best would be racing to be first and first to confirm. But the problem with the conspiracy theorist types is they are always looking for the special answer, the knowledge that makes them special instead of what 300 years of philosophy and science says is the best approximation of truth.
Cheers,
A guy who runs.