No, "there is a worldwide conspiracy to suppress Ivermectin so that Big Pharma can make vaccines" is clearly a conspiracy theory, it's not a tautology.
Why the tinfoil? When the WHO and the CDC/NIH and public officials lie repeatedly and demonstrably you can not trust them. Sort of invites wondering what the game is, because it's not public health.
Giving the benefit of the doubt (that new evidence is compelling), that still doesn't retroactively justify anything. The information available in the past is not affected by the informative available in the future. If we discover that Bush irrefutably orchestrated 9/11, that doesn't make the conspiracy theorists' rationales more rational. It feels natural to make that connection, but that's only in service of our side-taking tendencies.
The problem is that the quality/quantity of evidence has not changed.
Plenty of folks have been drawing attention to the lab leak hypothesis way before it reached mainstream, and they were using the exact same arguments and facts that the mainstream is co-opting now.
The only difference is that Trump is out of office, so people are less afraid to associate with the idea that the Lab Leak Hypothesis is worth investigating
Seriously, why all the tinfoil?