My personal quick rubric for determining if an ivermectin study showing improvement for cv19 outcomes is likely to be trustworthy:

Was the population being studied one where parasite infections that ivermectin can take care of are endemic?

Yes - improves outcomes in this population because many of them are likely to have parasites and killing them reduces strain on the body and frees up immune system resources to deal with covid

No - you'll find glaring flaws even in a quick once-over.

Hasn't failed me yet.