The Caly et al paper you cite is based on a cell culture (in vitro) experiment, not a clinical trial. No human subjects were tested, and subsequent researchers have had difficulty recreating the observed result. Virtually all other studies supporting ivermectin's use against COVID-19 have been shown to have serious flaws. To quote a review,"Research related to ivermectin in COVID-19 has serious methodological limitations resulting in very low certainty of the evidence, and continues to grow." [1]
If the Ivermectin crowd were really interested in finding an effective oral treatment for COVID-19, and not just manipulating a political prop, why are they silent on Molnupiravir, which has been shown to be effective in clinical trials [2]?
[1] https://ebm.bmj.com/content/early/2021/05/26/bmjebm-2021-111... [2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8219109/